--- Can you shoot that bird at the top of the tree?

--- No, it's out of ____.

A．range

B．reach

C．control

D．distance

若两圆x²+y²-2ax+4y+a²-5=0和x²+y²+2x-2ay+a²-3=0有3条公切线，则a=[ ]

A、-1或-2

B、-1或-5

C、-2或2

D、-5或2