The word "they" (sentence 4, para. 1) refers to ______.

A．have difficulty getting properly employed
B．be employed in the fields of commerce or industry
C．have to fill out application forms month after month for others
D．work in schools or colleges with low pay

A．It is more concerned with past events.
B．It is faced with major decisions about the Earth's future.
C．It is not aware of the problems it faces.
D．It has problems that do not require immediate attention.