Question

Which sentence does not contain any errors in comma usage? A.Candles which can provide light at night, are made from different kinds of wax. B.That house, which has been for sale for six months is one hundred years old. C.The book, that you are looking for, is right here. D.The car that he drove on the muddy road will need to be washed.
 I am thinking its C. could someone explain to me why its not or if it is. Please and Thank you!

Answer 1

Sentence C because it is an comma sandwich (apposotive)
An apposotive sentence uses commas to separate an additional fact or idea.
Example:  My dog, the white one, is very mean. 

hope i helped!