Answer:
The best answer is indeed letter C) Cholesterol is a fat-like substance derived mainly from animal fat that attaches itself to the walls of arteries causing heart disease.
Step-by-step explanation:
We were provided with a claim and then asked to choose a restatement to start the conclusion of this essay.
A conclusion has the purpose of restating what was previously claimed in a shorter way. Basically, it should claim the author's opinion again, but in fewer words. The conclusion should never present new information, otherwise it will be just and extent of the text's body.
Sentences A, B, and D should not be considered restatements of the claim "Cholesterol, in moderate amounts, is useful to the body, but in large amounts it becomes harmful to the body, causing heart disease." They are what we call evidence, meaning that the information present in them supports the claim, prove it true. Also, it is new information.
Letter C, on the other hand, restates - states again - what is said in the claim, but in a shorter way: cholesterol may cause heart disease. From that point on, we may write a few more lines to close the text's ideas. Its is, thus, the best option to start the conclusion.