Which sentence uses a prepositional phrase?

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

Read this excerpt from mohandas gandhi's "banaras hindu university speech." what is the speaker's purpose a. to persuade his audience to struggle for self-governance through peaceful means b. to urge wealthy indians to act instead of merely talk about poverty c. to inform the audience that the british colonial power is stealing indian resources d. to persuade his audience to renounce materialistic wealth and pursue spiritual wealth