Question

which sentence or sentences have correct parallel structure?
unlike some of his friends, who spend most of their time playing computer games, kenneth likes both going to the movies and to museums.
unlike some of his friends, who spend most of their time playing computer games, kenneth likes both going to the movies and touring local museums.

Explanation:

To determine correct parallel structure, we check the elements joined by "both...and". In the first sentence, "going to the movies" (a gerund phrase) and "to museums" (an infinitive phrase) are not parallel. In the second sentence, "going to the movies" and "touring local museums" are both gerund phrases, so they are parallel. The first sentence actually has an error in parallelism, but if we assume the checkmarks are part of the problem (maybe a mis - marked question), the second sentence has correct parallel structure.

Answer:

The sentence with correct parallel structure is: Unlike some of his friends, who spend most of their time playing computer games, Kenneth likes both going to the movies and touring local museums.