Question

Which of these sentences uses the infinitive as a subject?

"To err is human; to forgive is divine."
When I wrecked the car, it took a long time for Dad to forgive me.
Have you ever heard the saying "sometimes it is easier to forgive than to forget"?
Still, he passed up many opportunities to forgive me.

Answer 1

A. "To err is human; to forgive is divine." 

Answer 2

Answer: A) "To err is human; to forgive is divine."

Explanation: an infinitive is the basic form of a verb, without an inflection binding it to a particular subject or tense. The subject of a sentence is the person or thing that performs the action of the verb. From the given options, the sentence that uses the infinitive as a subject, is the corresponding to option A: To err is human; to forgive is divine, as we can see the phrases "to err" and "to forgive" are performing the action of the verb (is).