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%
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