4.
Your Answer is
Correct Answer is F
Explanation
whisk "Take... away" This sentence expresses "skiers rely on energy-intensive lifts to send them up the mountain." Here the to do purpose adverbial should be used.
G item: who cannot modify the front noun chairlifts.
Item H: whisked cannot be a predicate verb here, because rely has appeared in the previous text, so it is judged to be a passive attributive, chairlift cannot be taken away, and the semantics do not match.
Item J: The original form of the verb is wrong.