Which one of the following, according to the author was first discovered or invented in human civilization

A．Fire and the domestication of animals make agriculture possible.
B．Picture language and oral language might appear at the same time.
C．Gunpowder and marine's compass are as important as speech.
D．Language and communication are the most important factors for human development.

A．All the literary works can improve the readers' language, grammar and rhetoric.
B．Watching TV is not passive since it let watchers experience the sensation.
C．The literature remains not affected by TV in America.
D．Jerry Mander suggests that people should ban television to some extent.