【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】_______ students are playing on the ground.

【2020最新整理国开(电大)人文英语1-3896网上形考机考题库】_______ students are playing on the ground.
选择一项：
A. The number of
B. A number of
C. A number