Unfortunately, the aboriginal(土著) people tried in vain to win independence ______ the ruling tribe,

and prejudice ______ them still continued.[ ]

A. of, towards

B. on, for

C. from, against

D. by, over

油浸式变压器防爆管上的薄膜若因被外力损坏而被裂，则必须使变压器停电修理。