Answer:
B. SAS
Step-by-step explanation:
Two sides of ∆DEF (DE and DF) are proportional to two corresponding sides of ∆ABC (AB and AC), and also their included angles (<D and <A) are equal to each other.
Therefore, based on the SAS criterion, both triangles are proven to be similar to each other.
Both triangles satisfy the SAD Criterion, and hence, they can be proven to be similar to each other.
