Question

While revising an argumentative essay, a writer should include anecdotes and personal “I” statements. focus on including opinions more than evidence. make sure each paragraph has a clearly stated point. make the writing friendly and informal, engaging readers.

Answer 1

The correct answer is:  [C]:
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       →   "make sure each paragraph has a clearly stated point."
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Consider the other answer choices; as follow:
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Choice:  [A]:  "include anecdotes and personal "I" statements."  Doing so would weaken the "argumentative" position of an argumentative essay. Using the first person, "I", suggests using the thoughts, viewpoints, and opinions of the writer and should be avoided at all cost.  Anecdotes are weak and tend to focus on vague or isolated examples.   Rule out "Choice:  [A]" .
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Choice:  [B]:  "focus on including opinions more than evidence."  As aforementioned, opinions from those of the writer—and from those of others—weaken the "argument" of an argumentive essay since they tend to be biased and/or "cherry-picked".  Furthermore, opinions can be more easily swayed with other opinions AND other evidence as "counterexamples".  So to the contrary, the writer should focus on strong evidence more than opinions. 
    Rule out "Choice: [B]" .
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Choice:  [D]:  "make the writing friendly and informal, engaging readers." 
     The engagement of the readers to the work is a good idea; however, doing so while making the writing friendly and information should NOT be done.
A friendly and informal style weakens the "argumentative" aspect of an argumentative essay.  
    Rule out "Choice:  [D]" .
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Choice: [C]:  "make sure each paragraph has a clearly stated point." 
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       Note:  Among the answer choices provided, this answer choice is the best answer choice—and as such, the correct answer choice.  A clearly stated point within each paragraph defends the argument and helps provide a strong case.
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Answer 2

The answer is:
make sure each paragraph has a clearly stated point.

This is the only answer choice that would clearly strengthen your argumentative essay. You wouldn't want to make your essay informal, or biased.

This kind of essay requires doing the comprehensive research on a topic that is most commonly done by gathering information, processing the facts and evaluating the evidence.