Why do Americans try to conserve and manage time

A．Home accidents are as serious as road accidents.
B．The careless use of electricity is one of the main causes of home accidents.
C．modern electric equipment is too dangerous to be used with children and elderly people around.
D．So far people pay little attention to home accidents.

A．Because she was born there.
B．Because she worked there last year.
C．Because her sister vacationed there last year.
D．Because her sister and her vacationed there last year.