P is the mother of K; K is the sister of D; D is the father of J. How is P related to J?

The correct answer is A. Mother.

P is the mother of K. K is the sister of D. D is the father of J. Therefore, P is the mother of J.

Option B is incorrect because P is not the grandmother of J. A grandmother is the mother of a parent. In this case, P is the mother of K, who is the sister of D. D is the father of J. Therefore, P is not the grandmother of J.

Option C is incorrect because P is not the aunt of J. An aunt is the sister of a parent. In this case, P is the mother of K, who is the sister of D. D is the father of J. Therefore, P is not the aunt of J.

Option D is incorrect because there is enough data to determine the relationship between P and J. P is the mother of K, who is the sister of D. D is the father of J. Therefore, P is the mother of J.