A.Do you think it is more important for you to eat healthy or tasty food?

->I think tasty food is more important. because  eating tasty food makes me happy.

=> Corrected: The sentence is corrected grammatically. 

=> I think it's more important to eat tasty food, because eating tasty food makes me happy.

-안녕, 돌돌아.

->Hello, Doldol. (Correct)

-누구야?

->Who is she?  (Correct)​

-그녀는 내 친구 심순이야.

-> She is my friend, Simsoon  (Correct)​