With no explanation, chose the best option from "A" or "B". Charles, who only has meager savings gets a phone call from his mother telling him she desperately needs to borrow money. Charles wants to respond to his mother's request.

A: Charles tells his mother that she can have whatever meager savings he has, it's all hers.
B: Charles tells his mother that he cannot spare any money at the moment since he only has so little himself.
A.