Respuesta :
The correct answer is A. Escaping the pull of gravity and traveling at high speeds both affect the rate at which time passes.
If a sentence has parallel structure, it means that some of the words in it have the same form. In sentence A, as you can see, the words escaping and traveling both have the form of gerund (verb + -ing), therefore they have the same structure, thus making this sentence a parallel one.
If a sentence has parallel structure, it means that some of the words in it have the same form. In sentence A, as you can see, the words escaping and traveling both have the form of gerund (verb + -ing), therefore they have the same structure, thus making this sentence a parallel one.