You are alone in the house and there is danger of thieves around. Just then, you hear a knock at door. You would

first peep out from the window to confirm whether you know the person.

Lets see all the actions one by one :-

1) open the door to see who is there → Directly Opening the door is not the logical action.

2) First peep out of the window to confirm whether you know the person at the door → It is the most appropriate logical action because if it is someone whom you know, you know there is no danger and if there is someone unknown, you can take appropriate action.

3) not open the door. → Noth to open the door is fine but there can be known person . So, its not appropriate answer.

4) Ask the servant to see who is there → The sentence says that you are alone in the house. So this option is not applicable.
Answer :- (B) first peep out from the window to confirm whether you know the person.