The number of users who .......... support has increased since the company released the latest version of its software.

(A) require

(B) requires

(C) is required

(D) are required.

왜 답이 A번인가요??

만약에 a number of users who 빈칸 support has increased since the company released the latest version of its software.

여도 답이 A번인가요??