OG NO10

<However much United States voters may agree that> there is waste in government and that the government as a whole spends beyond its means, it is difficult to find broad support for a movement toward a minimal state.

(C) Although United States voters agree
(D) Even though United States voters may agree

正解はAだったのですが、正直どの選択肢にもこれといった決め手が無く、一番簡潔そうなCを選んでしまったのですが、どう正解までたどり着けるかご教授願います。