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?

The cat was chasing a mouse through the house.

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answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.