【正确答案】 C

【答案解析】原文Two members of the House Transportation Committee are pushing to reverse the administration's opposition to arming pilots because groups representing pilots are insisting that their members need to be armed as a last line of defense．中文意思是：House Transportation Committee中的两个成员力图推翻administration反对武装pilot。可见，反对武装pilot的是administration。而pilot自身，原文中也有提及，pilot的代表群体坚持认为他们的成员需要被武装，作为他们最后一道安全线。