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To justify statement 3, which claims that segment \( BD \cong BD \), we can recognize that this is based on the **Reflexive Property**. The Reflexive Property states that any segment is congruent to itself, which applies here for \( BD \) in both triangles \( \triangle ABD \) and \( \triangle CBD \).

So, the correct answer is:

**B. Reflexive Property**

Would you like further details on any steps of this proof?

### Related Questions
1. What is the Reflexive Property, and where else can it be applied in geometry?
2. How does the Angle-Side-Angle (ASA) postulate prove congruence between two triangles?
3. What other properties are commonly used in triangle congruence proofs?
4. How does the Transitive Property differ from the Reflexive Property in geometry proofs?
5. Could other methods besides ASA be used to prove congruence for \( \triangle ABD \cong \triangle CBD \)?

### Tip
In geometry proofs, it's helpful to list all known properties (like Reflexive, Symmetric, and Transitive) to quickly identify which applies to specific steps.

Which is the correct reason that will justify statement 3 in proving triangle ABD is congruent to triangle CBD?

Learn how to use the Reflexive Property to prove triangle congruence in geometry proofs. This solution explains how to justify statement 3 in proving that triangle ABD is congruent to triangle CBD using the Angle-Side-Angle (ASA) Postulate, suitable for Grades 9-10.

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