Here's why:
* Prepositional phrases begin with a preposition (like "because of") and are followed by a noun or pronoun (the object of the preposition).
* "Because of" itself functions as an adverbial phrase, meaning it modifies a verb, adjective, or another adverb.
Example:
* "He was late because of the traffic."
* "Because of" is the prepositional phrase.
* "Traffic" is the object of the preposition.
* "Because of the traffic" modifies the verb "was."
Let me know if you'd like more examples!