1. Not a Noun Phrase
2. Noun Phrase
3. Not a Noun Phrase
4. Not a Noun Phrase
Option number 2 is the only Noun Phrase. The Noun Phrase “Two of the biggest factors”, which has the syntactic function of Subject, is made up of the nucleus “two” which is modified by a prepositional phrase “of the biggest factors”. The underlined group of words in option number 1 is a main clause from a complex sentence, since the whole sentence is a conditional. The underlined group of words in option number 3 is part of a to infinitive clause “to help pay for the services they provide”, functioning as an adverbial of purpose. The underlined group of words in option number 4 is a verb phrase which is made up of the nucleus “will be” and the postponed subject “a wide price range”.