A.
B. and C. both are missing commas in their sentences. A doesn't require a comma anywhere
Answer - Infinitive
A verb that starts with "to" is in an infinitive verb form. Typically, an infinitive can function as adverbs, adjectives or as nouns; it usually does not function as a verb. Also, an infinitive <span>has no inflection binding it to a particular subject or tense.</span>
Requirements are Money and You have to pay the pending bills and current bills so you have to pay them saving money is using less electricity
A is the answer. They use this to reason with one person.
