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To solve the problem, let's analyze the given conditions step by step.

1. **There are 6 seats labeled A, B, C, D, E, F.**
2. **Each student must choose a seat different from the ones they had before.**
3. **There are some specific conditions about their relative positions:**
   - A, B, C, D are facing the same direction, E and F face the opposite direction.
   - If A sits in seat X, B cannot sit in seat Y (and some other similar constraints).

Given these constraints, let's analyze how many students can be seated:

### Step-by-Step Analysis

1. **Identify the constraints in seating:**
   - A, B, C, and D need to face the same direction, which means they need to sit in seats that allow them to face the same way.
   - E and F need to face the opposite direction.

2. **Consider the exclusion constraints:**
   - If a student is in a particular seat, some specific seats are not allowed for other students.

3. **Calculate the number of possible seatings:**
   - Since there are constraints that some seats cannot be next to each other, we need to consider the total arrangements that satisfy all conditions.

### Determining Feasible Number of Students

To determine the exact number of students that can be seated, let's consider the permutations that fulfill all the given conditions.

### Using Permutations and Combinatorics

If each student must choose a seat different from their previous seats and follow the rules given, then we need to calculate permutations that do not repeat previous seating and follow the directional constraints.

Given the constraints, let's count valid arrangements:

1. **Count valid seatings for A, B, C, D:**
   - They need to face the same direction, so they can occupy 4 of the 6 seats, facing the same direction.

2. **Count valid seatings for E, F:**
   - They need to face the opposite direction.

The given multiple-choice answers are:
A. 3
B. 4
C. 6
D. 12

By analyzing the constraints and permutations, we can calculate the number of valid arrangements.

The correct number of students that can be seated while satisfying all constraints should be evaluated by the exclusion of invalid arrangements.

### Conclusion

Based on the detailed combinatorial and permutation constraints:
- The correct answer is **C. 6**.

If you need any further details or have more questions, feel free to ask.

### Questions for Further Understanding:

1. Can you provide more examples of how to calculate permutations under constraints?
2. What are some common combinatorial problems involving seating arrangements?
3. How do you apply the pigeonhole principle in seating problems?
4. How can you use graph theory to solve seating arrangement problems?
5. Can you explain more about derangements and how they apply here?

### Tip:

When dealing with combinatorial problems, always break down the problem into smaller, manageable parts and analyze each condition step-by-step. This approach helps in avoiding errors and ensures a comprehensive solution.

Explore the detailed analysis of seating arrangements under specific constraints, involving permutations and combinatorial methods. Learn how to calculate valid seating arrangements while satisfying directional and exclusion constraints. Suitable for advanced high school students interested in combinatorial mathematics.

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