I'm afraid his criticism can't help ____ their service.A.to improving B.improving C.improve D.for improvingWhich one?Why?

I'm afraid his criticism can't help ____ their service.A.to improving B.improving C.improve D.for improvingWhich one?Why?
I'm afraid his criticism can't help ____ their service.
A.to improving B.improving C.improve D.for improving
Which one?Why?

I'm afraid his criticism can't help ____ their service.A.to improving B.improving C.improve D.for improvingWhich one?Why?
正确答案C.B选项意思为情不自禁.help 后接动词原形,或直接加动词原形

B cant help doing

C
表示有助于,help to do 或 help do
can't help doing 表示情不自禁做某事