[单选题]
Ignoring air resistancerxmf(lu+nszm7 :0(k4 rwjz: a, the hor 70im.zv 4oykg q-p;erizontal component of a projectile's acceleration;v-qo mrz.iy e0g47pk
A. is zero.
B. remains a non-zero constant.
C. continuously increases.
D. continuously decreases.
