在建筑石材的性能评价中，下列哪项不正确

A．岩石中SiO₂含量越高，耐酸性越强
B．岩石晶粒越粗，强度越高
C．致密的岩石抗冻性好
D．深成岩和变质岩易于取得大材，并可雕琢加工

（），he had to leave school.

A.Sincehisfather’sunemployment

B.Sincehisfatherwasunemployed

C.Hisfatherwasunemployment

D.Becauseofhisfatherwasunemployment