The correct option is A Yours
Out of the four options, option D is correct. Possessive pronouns are those pronouns which show possession or ownership in a sentence. Apostrophe can be used to show that a letter or letter(s) is missing from a word. In the given sentence, apostrophe replaces the letter 'i', and the two words (Your and Is) are joined to make one. The given sentence shows possession. Thus, 'Yours' is the correct answer.