which of these sentences shows correct comma usage?

Question

A.Yes i enjoy writing poetry in my spare time.(I PICK THIS)

B.After,a while,i suppose,the boy became less scared of the new girl.

C.By the end of the first stanza,i had guessed that the new kid was a girl.(I PICKED THIS)

D.before he walked down the street he checked to make sure the new kid wasn"t there.

Answer 1

Which answer did you pick?

Answer 2

Right.