What is the purpose of "enormous amounts of food" in the following sentence:
→ During the summer bears eat enormous amounts of food in preparation for their winter hibernation.

- It is an adverbial clause that explains how bears eat.

- It is a noun phrase that acts as the object of the verb eat.

- It is a prepositional phrase that provides more information about bears.

- It is an independent clause that provides more information about hibernation.