According to the conversation, the main benefit of the overhead projector is thatA．it prod

According to the conversation, the main benefit of the overhead projector is that

A．it produces a visual effect and makes the talk more dynamic.

B．it makes the talk well delivered and more attractive to the audience.

C．it helps the audience build their confidence and get involved in the talk.

D．it helps the speaker get more chance of being employed.

请帮忙给出正确答案和分析，谢谢！