What is a group of words that begins with a preposition and ends with an object?

a. prepositional phrase
b. adverbial phrase
c. prepositional relationship
d. dependent clause

answer is a. prepositional phrase

a prepositional phrase begins with a preposition and ends with its object.

Prepositional phrase

Explanation: Prepositional phrases always start with a preposition and always end with a noun or a pronoun called the object of the preposition.

Let's look at an example.

A vase of flowers fell on the floor.

We have two prepositional phrases in this sentence. "Of flowers" would be one because "of" is a preposition and "flowers" is the object.

"On the floor" would be another prepositional phrase because "on" is a preposition and "floor" is the noun that it works with.  

well basically since ima beginner people will answer any subject "right away"and if you get more points you could ask more questions or if you answer someone's question you get points