Question

select the three prepositional phrases. is it productive to stay awake all night cramming for a test? some researchers advise against late nights, since sleep is a critical component of academic success.

Explanation:

A prepositional phrase starts with a preposition and ends with a noun or pronoun. In the given text, "for a test" starts with the preposition "for", "against late nights" starts with "against", and "of academic success" starts with "of".

Answer:

for a test, against late nights, of academic success