Answer:
B
Explanation:
CPCTC means "corresponding parts of congruent triangles are congruent." For CPCTC to work, you need to have a pair of corresponding parts of the two triangles, either a pair of corresponding sides or a pair of corresponding angles.
By the statement of congruence, of all the choices, the only choice that shows a pair of corresponding parts is choice B, so choice B is the answer.