Question

Which sentence has an infinitive phrase that functions as the subject? The hike to Mount Washburn reveals beautiful scenery. Guides are happy to meet the needs of visitors. To hunt in the park is a serious offense. The Yellowstone River flows north to the valley.

Answer 1

The answer is:
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    "To hunt in the park is a serious offense."
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Note:  The 'infinitive phrase that functions as the subject is:  'To hunt' .
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Answer 2

The correct answer is:

To hunt in the park is a serious offense

Explanation:

An infinitive phrase uses the "to" form of a verb, used as a noun (subject, object), a subject complement, an adjective, or an adverb. The infinitive phrase carries the object or alterants of the infinitive. Examples. To simply relax is often tough for him. (to relax is the subject, to simply relax is the infinitive phrase) . He seldom tries to win the lottery. (to win is the object of tries, to win the lottery is the infinitive phrase.