Explanation:

Let’s break this puzzle down point by point:

- There are six people: Mr A, Mr B, Mrs C, Miss D, Mr E, Miss F.

- Six roles: manager, assistant manager, cashier, stenographer, teller, clerk.

Clues explained:

- The assistant manager is the manager’s grandson. This means the manager must be old enough to have a grandson.

- The cashier is the stenographer’s son-in-law. So stenographer is older (and must be married or a parent-in-law).

- Mr A is a bachelor—so he cannot have a grandson or son-in-law.

- Miss D is the teller’s stepsister.

- Mr E is the manager’s neighbour (no role link, just a relationship outside the office).

- Mr B is only 20 years old, so he can’t have a grandson or son-in-law.

Let’s check the options:

1. Mr A: Bachelor. So, can’t have a grandson (not married, no kids, let alone grandkids). He can’t be the manager.

2. Mrs C: Could be old enough. Possible.

3. Mr E: Could be possible, but he’s said to be the manager’s neighbour, so he’s not the manager himself.

4. None of the above: Maybe.

So, who fits?

- Mr B is too young.

- Mr A is a bachelor—no kids or grandkids.

- Mr E is ruled out.

- Mrs C’s age/gender fit—she could have a grandson. That fits the logic.

So, the answer is:

Option 2: Mrs C

What this really means is: The right pick is Mrs C. Mr A doesn’t fit because he’s single and can’t have a grandson. Mrs C is the only one who ticks all the boxes.