Which sentence contains an infinitive

The sentence that contains an infinitive is 2. Although she was busy, Clayton's mother offered to give him a ride. An infinitive phrase contains a verb in its infinitive form after the preposition "to". In this case, the infinitive phrase is "to give"

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself.

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