King evokes what type of appeal in his audience by mentioning the various historical documents, such as the Emancipation Proclamation, the Declaration of Independence, and the Constitution?

Ethical appeal (Ethos)

Logical appeal (Logos)

O Emotional appeal (Pathos)

Logical appeal (Logos)

Explanation:

Logical appeal, also known as Logos is one of the three modes of persuasion that appeals to logic or reason. To support an argument using logos, facts, statistics, and history are referenced. In the Speech, "I have a Dream", by Martin Luther King, the Emancipation proclamation by Abraham Lincoln which was declared 100 years ago, was referenced at the onset of the speech and this served as a logical appeal to history.  

The Declaration of Independence and the Constitution were also references to history aimed at supporting King's arguments.

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