Though _____ money, his parents managed to send him to university.[ ]

A. lacked

B. lacking of

C. lacking

D. lacked in

监理单位应当按照水利部的规定，取得《水利工程建设监理单位资质等级证书》，并在其资质等级许可的范围内承揽水利工程建设监理业务。