The reference of st. augustine adds to the the credibility of dr. king's argument about just and unjust laws mainly by answer choices for the above question a. showing he has vast knowledge of history b. proving to his audience that other trusted people from history agree with him c. illustrating his ability to quote people on the spot d. entertaining his audience by including other people's ideas

The correct answer is B.

St. Augustine was a Christian theologian and philosopher. He reflected on peace and justice, and his teachings are still used in the modern world.

Therefore, by quoting such an important figure in the philosophy sphere, and showing that he shared the same point of view as he does now, King makes his argument stronger and increases his credibility.

alright, so here, the author clearly thinks that flooding the canyon was a bad idea and is showing bias against it.

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,