All the people in this company have been instructed _____ the survey they did yesterday.A.returnB.return's C.to return D.to return's

All the people in this company have been instructed _____ the survey they did yesterday.A.return
B.return's C.to return D.to return's

All the people in this company have been instructed _____ the survey they did yesterday.
A.return B.return's C.to return D.to return's
选C
句意是：公司所有的人已经被指示要求反馈昨日所做的调查.