What’s the probable relationship between the two speakers

[A] Because Mary broke his glass and didn’t say sorry to him.
B. Because he broke Mary’s glass.
C. Because Mary didn’t answer his question politely.

A．the brain begins processing and storing memories just before it's time for bed
B．parts of the brain that we have not used to learn become active again during sleep
C．the processing continues only when they're thinking about or doing other things.
D．each task requires different parts of the brain to learn.