[单选题]
Ignoring air resistance, the horizontal component of a projectile's acceler n0e.qnpbk ip )hd), 0a6g*cdxationk)p, *p)db6 n n.idea0q c0xhg, mu,c mpnya9;,a;mcu ,m 9ynp
A. is zero.
B. remains a non-zero constant.
C. continuously increases.
D. continuously decreases.
