*this is the best photo i have* question: what is the reason for the statement in step 8
a. third angle theorem
b. triangle proportionality theorem
c. congruent complements theorem

Then why is the question on here if you know the answer

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.