【正确答案】 A

【答案解析】此题属于语意搭配题。reduce...to表示“减少到……”，例如；The great fire reduced the forest to a few trees．大火把整座森林烧得只剩下几棵树。根据下文：reducing budget deficits to 4 percent可知，选项[A]to正确。选项[B]by与reduce连用，意为“减少了…”，例如：reduce one's weight by 5 pounds(减重5磅)；选项[C]with和[D]until不与reduce连用。