Which of the following sentences includes the use of a gerund?

the dog’s favorite activity is barking.
the cat was chasing a mouse through the house.
the horse was galloping down the road.
the cow was chewing on the fresh hay.

what is the gerund?

Until 1987, in cases of extradition,a. all fugitives were protected from extradition by their political beliefsb. all fugitives were protected from extradition by their racec. the federal government could not force a state governor to return a fugitived. the federal government had the power to force a state governor to return a fugitive