Mark the letter A, B, C or D to indicate the sentence that is BEST written from the words/phrases given.   Most of the books/ I read/ as a child/ be/ still popular/ today. 

Most of the books which I read them as a child are still popular today.

Most of the books whom I read as a child are still popular today.

Most of the books which I read as a child are still popular today.

Most of the books who I read as a child are still popular today.