"The computer must belong to my father. " means "_____".[ ]

A. My father's name is on the computer 

B. My father hasn't a computer

C. The computer must be my father's

D. That can't be my father's computer

根据《合同法》的规定，当事人对合同变更的内容约定不明确的，应( )。

A．由当事人诉请人民法院裁决

B．由当事人申请仲裁委员会裁决

C．推定为未变更

D．视为已变更