In δabc shown below, : the following flowchart proof with missing statements and reasons proves that if a line intersects two sides of a triangle and divides these sides proportionally, the line is parallel to the third side: which reason can be used to fill in the numbered blank space? a. 1. ∠a ≅ ∠a 2. reflexive property of equality b. 1. ∠a ≅ ∠b 2. corresponding parts of similar triangles c. 1. ∠a ≅ ∠b 2. corresponding angles postulate d. 1. ∠b ≅ ∠b 2. reflexive property of equality