What is the net present value rule?

A、If net present value of an investment is positive, we would accept it. If net present value of an investment is negative, we would reject it.;

B、If net present value of an investment is negative, we would accept it. If net present value of an investment is positive, we would reject it.;

C、If net present value of an investment is positive, we would accept it.;

D、If net present value of an investment is negative, we would reject it.