Đáp án đúng: B Giải chi tiết:"The first photograph was taken with a very simple camera." (Bức ảnh đầu tiên tôi được chụp với chiếc máy ảnh rất đơn giản). Căn cứ trong bài: "...he invented a very simple camera. He put it in a window of his house and took a picture of his yard. That was the first photograph".