Travelers to Mars would have to endure

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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.

(A) contend with the chemically reactive Martian soil, and perhaps even having to ward
(B) contend with the chemically reactive Martian soil, and perhaps even warding
(C) contend with the chemically reactive Martian soil, and perhaps even ward
(D) contending with the chemically reactive Martian soil, and perhaps even to ward
(E) contending with the chemically reactive Martian soil, and perhaps even warding

How will I identify the best Option?

OA C

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by GMATGuruNY » Wed Jan 17, 2018 4:13 am
and must serve to connect PARALLEL FORMS.

A: Travelers would have to endure, avoid, contend, and perhaps even having
B: Travelers would have to endure, avoid, contend, and perhaps even warding
D: Travelers would have to endure, avoid, contend, perhaps even to ward
E: Travelers would have to endure, avoid, contending, and perhaps even warding
In these options, the forms in red are not parallel with the forms in blue.
Eliminate A, B, D and E.

The correct answer is C.
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