Question in image below.

A.) CPCTC

B.) Definition of angle bisector

C.) AAS Theorem

D.) Reflexive Property of Congruence

It is CPCTC because in the previous statements you essentially proved the congruency of the two triangles. If they are congruent, that means all the corresponding sides in those triangles are congruent.
(CPCTC = Corresponding parts of congruent triangles are congruent)

CPCTC

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats