Question

which sentence uses a prepositional phrase?
given the economic and political unrest, the family decided to emigrate.
ruling brutally, the harsh dictator caused many people to flee the country.
increasing tensions required that international diplomats begin to negotiate.
some editorials exposing government corruption were leaked to the public.

Explanation:

A prepositional phrase is a group of words that begins with a preposition and ends with a noun or pronoun (the object of the preposition). In the sentence "Given the economic and political unrest, the family decided to emigrate", "Given the economic and political unrest" is a prepositional phrase (with "Given" as the preposition and "the economic and political unrest" as the object). The other sentences do not have prepositional phrases. In "Ruling brutally, the harsh dictator caused many people to flee the country", "Ruling brutally" is a participle phrase. In "Increasing tensions required that international diplomats begin to negotiate", there is no prepositional phrase. In "Some editorials exposing government corruption were leaked to the public", "exposing government corruption" is a participle phrase.

Answer:

Given the economic and political unrest, the family decided to emigrate.