问题详情

What was another contribution by Edison to the movies？
A．He introduced the 35 mm standard machine to the world.
B．He introduced the 35 mm as the international standard film width.
C．He created a 35 mm standard device for showing movies.
D．He created his own standard devices for showing 35 mm film.请帮忙给出正确答案和分析，谢谢！