What is typically an important feature of an author's argument A) thesis
B) evidence
C) conclusion
D) all of the above

D). All of the above

Explanation:

An author's argument possesses all the given features namely; thesis, evidence, and conclusion. The thesis displays the key idea or central claim of the essay or paper that the author is going to present and aware the audience of the content, scope, direction, and purpose of the essay or paper. While sufficient evidence function to support and substantiate the claim before the readers/audience. It establishes the objectivity and credibility of the claim. Lastly, the conclusion functions to restate the key ideas discussed in the paper/essay again along with the concluding remarks to remind the readers that the purpose of the essay(as mentioned in the thesis statement) has been successfully accomplished and the message or lesson they can take away from it. Thus, option D is the correct answer.

the answer is a)   a sentence of death costs the state "almost three times as much as a sentence of life in prison" (delon 147)

the most appropriate strategy would be to do a questions and answer type speech.