设X与Y为随机变量，D(X)=3,D(Y)=2，Cov(X,Y)=0,则D(5X-3Y)=

设X与Y为随机变量，D(X)=3,D(Y)=2，Cov(X,Y)=0,则D(5X-3Y)=
A、8
B、9
C、87
D、93
【正确答案】：D