He is considerate.
Answer: Option A.
Step-by-step explanation:
According to the passage that has been given here, the character of Armand has shown to be very considerate. He has been shown as a responsible boy who is trying to put ahead the fact that he is the oldest of all and responsible for the other children also.
His thought of wanting to buy his father a birthday present shows his maturity and being considerate, and the fact that he is siding with his parents (clearly more than he has in the past, based on the narrator's impatience) shows that he is trying to be more adult and grown up and has changed over a period of time.