[单选题]
A stone is thrown straighju leg52f 4seux4-oh/t up. A d5lmyb6h3qrkp )j85awu 1c8ft the top of its path, the net force acting on ithp583mrf k q dua j8lbwc15y6) is
A. greater than its weight.
B. greater than zero, but less than its weight.
C. instantaneously equal to zero.
D. equal to its weight.
