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"

why does the crew join ahab's quest without hesitation?

the correct answer is:   [d]:

              →       " fond of fighting " .

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