Ali: how do you do, jemal?
jemal:
c. i am fine and you
a. how do you do
d. you are welcome
b. i am to meet you

The answer is C) I am fine, and you?

The answer that Ali was asking was about how he was feeling at that moment. Kemal has to respond to that first answering the question and then asking the same to him. Though A also asks him the question, it does not make sense as he did not answer the question first.

Here would be the new conversation:

Ali: How do you do, Jemal?

Jemal: I am fine, and you?

Hope this helps comment below for more questions :)