Is the human use of spoken or written words as a communication system.
a. syntax
b. grammar
c. language
d. vocabulary

The correct answer is C. Language

Explanation:

The word language refers to the ability of humans to communicate with others by using verbal conventions such as words, non-verbal such as gestures and written ones such as texts. In this way, language is the system of conventional communication as spoken, written words and symbols have a meaning that has been agreed by the member of a group, community or society and thus, understood by all the members of it. It is believed there exist around 6000 different languages each with their own oral and written conventions but despite the differences between them, all focus on human communication. Thus, the human use of spoken or written words as a communication system is called or defined as Language.

the answer is slaves

douglas was a slave who turned into a statesman and he refused to celebrate the 4th of july until all slaves were emancipated or set free.