现在进行时疑问句与否定句 — 英语选择题

Su Hai 正在厨房里帮妈妈做饭。她想问爸爸是否在洗土豆，并想说明她自己没有在煮汤。下面哪一句表达是正确的？A. Is your father washing potatoes? I'm not cooking soup. B. Is your father washing potatoes? I not cooking soup. C. Does your father washing potatoes? I'm not cooking soup. D. Is your father wash potatoes? I amn't cooking soup.