[单选题]
As a freely falling objec*rsyat i4mz: 2*i*r qwt speedsnycqb4+ua ;bvne / e3mp 38:bn up, what is happening to its acceleration, how does it cc:3; 4ybbpbu 3vn m+/eea nq8nhange if air friction is ignored?
A. keep the same
B. increase
C. decrease
D. hard to tell