The correct answer to the question is:

B. A sequence in which the difference between any two consecutive terms is a constant.

Explanation:

An arithmetic sequence is defined as a sequence where the difference between any two consecutive terms is constant. This constant is called the "common difference," denoted as $d$.

For example:

• In the sequence $2, 5, 8, 11, \ldots$, the difference between consecutive terms is $5 - 2 = 3$, $8 - 5 = 3$, etc., so the common difference $d = 3$.

Let me know if you'd like additional explanations or examples!

Related Questions:

1. How can you find the $n$-th term of an arithmetic sequence?
2. What is the formula for the sum of the first $n$ terms of an arithmetic sequence?
3. How do arithmetic sequences differ from geometric sequences?
4. Can an arithmetic sequence have a common difference of zero? What does that mean?
5. What are real-life examples of arithmetic sequences?

Tip: When identifying sequences, remember to carefully check for consistent changes (difference, ratio, etc.) to classify the type of sequence.