The italicized word or phrase <em>a three-pronged </em>(if this is italicized, we cannot possibly know) is attributive, as it is an adjective to describe the plan.
warrant/support is were it should be
The answers to this is c
I think the correct answer from the choices listed above is the last option. It is in the sentence "We were stuck in the parking lot behind all the exiting cars." that the word exiting is a gerund. Gerunds<span> are words that are formed with verbs but act as nouns. Hope this answers the question. Have a nice day.</span>
