Based on the following relations, which of the given options indicate that W is the niece of X?
A+B means that A is the brother of B.
A*B means that A is the father of B.
A-B means that A is the sister of B.

Option 1) From Option 1, we cannot determine W's gender, but we can say that W is either the brother or sister of X, which is not the required relation.

Option 2) From Option 2, we cannot determine the gender of x, but we can say that W is the father of X, which is not the required relation.

Option 3) From Option 3, we can determine that W is the niece of X.

Option 4) From Option 4, we can determine that W is the daughter of X, which is not the required relation.

Only option C gives the required relationship, i.e., W is the niece of X.

Hence, the answer is option C.