Which question should a reader ask to identify an author's purpose? why did the author write this text? what evidence does the author provide? what is the author's opinion on this topic? how effective is the evidence?

 The question that a reader should ask to identify an author's purpose is "Why did the author write this text?"  

 There are various reasons why a text is written and it becomes evident in the type of language and words used by the author; Usually, it is written for the following purposes:

A. Why did the author write this text?

Explanation:

I did the test

the price of our current war is high; it costs money and it costs lives.

but it does not cost our pride. it does not cost the guilt that would arise from knowing that we did nothing to intervene while our neighboring nations fell to despotic leaders.

it does not cost the terror of knowing that our allies are unstable. it does not cost the fear that we, too, will be next to fall.

which sentence most accurately explains why the speaker's use of the parallel structure is effective in this passage?

a. it underscores that disagreement will not be tolerated and will be dealt with swiftly.

b. it makes the speaker seem like a decisive and capable leader.

c. it emphasizes reasons to fight and inspires listeners to aid the war effort.

d. it establishes the speaker's credibility by acknowledging the difficulties of war.