单项选择题

A.45xx,-14,+t(14q,21q),子代发病率危险率10%~15%
B.45xx,-14,+t(14q,21q),子代发病率危险率30%~40%
C.45xy,-14,+t(14q,21q),子代发病率危险率20%~15%
D.45xx,-14—21,+t(14q,21q),子代发病率危险率10%~15%
E.48xx,-14—21,+t(14q,21q),子代发病率危险率10%~15%