可数名词单复数变化规则 — 英语选择题

为家庭相册整理英文标签，下面哪一组名词的复数形式全部正确？A. family—familys，cousin—cousins，class—classes B. family—families，cousin—cousins，class—classes C. family—families，cousin—cousinies，class—classes D. family—families，cousin—cousins，class—class