The answer is D) doubt. I know this because when you use context clues this the most understandable.
The phrase that is infinitive is given in option (a): to go to the store. Therefore, "to" is the first word, "go" is the verb, and ends with the place "store."
<h3>What are infinitive phrases?</h3>
A combination of words known as an infinitive phrase includes an infinitive, a modifier, pronouns, direct objects, indirect objects, or complements of the action or state described in the infinitive.
Find the word to first, then look for the infinitive phrase. Second, it is an infinitive if the word immediately after to is a verb. Third, the infinitive phrase starts at to and finishes at the end of the sentence if it occurs in the midst of the sentence.
Alternative example:
Dawn assisted her friend in making a cake for his mother.
('Helped' is the "special" verb.) Her companion is the direct object. The bare infinitive of the infinitive phrase is "bake." A cake is its direct object. This time, the infinitive sentence also has an indirect object ("his mother").
Hence, option (a) contains infinitive.
Check out the link below to learn more about infinitive phrases;
brainly.com/question/1616363
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Why did settlers in Jamestown almost starve?
They lacked the basic farming techniques required to grow sustainable crops.
What was the name of the Native American girl who saved Smiths life? Whom did she marry?
Answer 1. Pocahontas saved John Smith's life.
Answer 2. Pocahontas married John Rolfe.
D, money does not bring as much happiness as friendship. Also, SINCE WHEN HAS BACCHUS BEEN MERCIFUL?!