Thông tin: This trend was accelerated in the late 1920s as a result: of two new elements. In 1927 sound was added to the previously silent film, and thus one of the theater's principal claims to superiority vanished. In 1929 a serious economic depression began. Since audiences could go to the movies for a fraction of what it cost to see a play, theater going became a luxury that few could afford, especially as the depression deepened.

Đáp án đúng D. the shift away from the theater to the movies was speeder up.