Writers should include references to their research in an argument because it adds credibility to the argument to the argument they wish to prove.
It would be C because you are making an educated assumption based on what you have read
I. Cooking
A. How much does it cost?
B. __________
<span>C. How healthy is it?
The missing piece of the outline is </span><span>D.) How much time/effort does it require?
As you can observe, the choice follows the same format as the given two. It starts with the word How. This is to maintain cohesiveness in the outline. </span>
