The officers made it clear that they were letting her go only because that she was old and not because she was above suspicion.

A．for reason

B．due to

C．because of

D．on the grounds

下列对国务院的认识，正确的是（   ）

A．它是国家最高权力机关

B．它是最高权力机关的执行机关

C．它是我国重要的国家机构，拥有制定法律的权力

D．它与其他国家机关的关系是监督与被监督的关系