The correct answer is C. To reform the health care system
Step-by-step explanation:
In grammar, when a set of different items are related to the main sentence the most appropriate and correct is to present the items by using the same pattern or grammatical structure, which is called parallelism. This makes sentences clearer, shorter and easier to understand for the reader as the repetition of the same grammatical structures makes the sentence flow better.
This implies if you need to complete a sentence that contains elements or items in a list as in the case presented the best option is to use the same grammatical structure used in the rest of the elements. Considering this, in the case of the sentence "If elected president, I resolve to accomplish several things. I intend to win the war on terror, ___________, and to balance the budget" in which the elements presented use the infinitive form (to+verb) as in "to accomplish" and "to balance" the best way to complete the sentence is to choose the statement that includes the same grammatical structure or "To reform the health care system" as this continues with the repetition of the grammatical structure and makes it easier for the reader to understand.