单项选择题

Some rich people consider themselves unsuccessful because _________.
[A] their life is miserable [C] their goals are too low
[B] they do not live in peace [D] they are not rich enough by their own standards

A.Some rich people consider themselves unsuccessful because _________.
B.their life is miserable
C.they do not live in peace
D.their goals are too low
E.they are not rich enough by their own standards