Answer :
C. Are those jeans hers or his.
D, is using the contraction "it is" not the possessive, "its". Theirs would not be correct either because you are talking about one group and one thing, so A is incorrect. B, is not right because "your's" would be "yours". So C is correct because hers and his makes sense.
D, is using the contraction "it is" not the possessive, "its". Theirs would not be correct either because you are talking about one group and one thing, so A is incorrect. B, is not right because "your's" would be "yours". So C is correct because hers and his makes sense.