Question

Which sentence does not contain any errors in comma usage?

A.
In the back of the closet, you'll find a box of old clothes.

B.
Yes I already sent a thank-you card to Grandma.

C.
Walking along the path I hummed a song to myself.

D.
Before the sun set, I brought in the chairs, that I had left in the yard.

A?

Answer 1

It's A since,
B.
Yes, I already sent a thank-you card to Grandma.

C.
Walking along the path, I hummed a song to myself.

D.
Before the sun set, I brought in the chairs that I had left in the yard.

Answer 2

So yup, you're right :D

Answer 3

thanks!