GMAT Sentence Correction (SC) | Travelers to Mars would have to endure low levels of gravity

Travelers to Mars would have to endure low levels of gravity for long periods of time, avoid large doses of radiation,contend with the chemically reactive Martian soil, and perhaps even having to ward off contamination by Martian life-forms.

Issue:Parallelism

Analysis: This is a straightforward parallelism question that requires all the verbs in the sentence to be in infinitive forms (since two non-underlined actions are already in infinitive form)

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