He fell off the bike and hurt his leg yesterday._______, he had to stay at home for two or three months.
A:So that
B:As a result
C:Such as
D:Because of
如下图所示,A、B、C是圆O上的三点,CO的延长线与线段AB交于圆内一点D,若OC→=xOA→+yOB→,则 ( )