The audience of a public speech is different from the readers of an essay in that _____.
选项：

A:they have no chance to rewind to the opening to form a balanced view of the whole speech;
B:they usually are more sensitive to oral language rather than written language;
C:they draw their own conclusion from the previous parts of the speech;
D:they prefer to listen to a public speech to reading an essay or watching a recorded TV drama