Study the following information carefully and answer the questions given below.

There are seven members in a family. There is no single parent. P is the only daughter of S. M is the grandmother of X. K is the brother-in-law of B. S is the husband of M. A is the only niece of B.

Who among the following is the grandmother of X?

Correct Answer: None of these

Let us analyze the given family information step-by-step to determine the relations among the seven family members:

1. "S is the husband of M" and "M is the grandmother of X":
S (Male) is married to M (Female). Since M is a grandmother, S is the grandfather. M and S form a married couple in the topmost generation.

2. "P is the only daughter of S":
Since M and S are married, P is also the daughter of M. P is female. Because P is the only daughter of S, any other child of S and M must be male.

3. "There is no single parent":
Every person in the family who has a child must have a spouse present in the family.

4. "K is the brother-in-law of B" and "A is the only niece of B":
For A to be the niece of B, A must be the daughter of B's sibling. Since P is the only daughter of S/M, and A is in the third generation (niece/grandchild level), A is female. B must be a son of S and M (making B a brother to P). K is married to P, making K the brother-in-law of B. Thus, P (Female) and K (Male) are married, and their daughter is A (Female).

5. Grandchild X:
M is the grandmother of X, so X belongs to the youngest generation alongside A. Since B is also married (due to the "no single parent" rule), X could be the child of B and B's spouse.

Now, let us evaluate the question:
"Who among the following is the grandmother of X?"

From the given statements, M is explicitly stated as the grandmother of X ("M is the grandmother of X").

Looking at the given options:
- Option 1: P
- Option 2: S
- Option 3: B
- Option 4: Either P or S
- Option 5: None of these

Since M is the grandmother of X and M is not listed among options P, S, or B, the correct choice is None of these.