Travelers from Earth to Mars would have to endure low levels of gravity for long periods of time, avoiding large doses of radiation, plus contending with the chemically reactive Martian soil, and perhaps even ward off contamination by Martian life-forms.
A. Mars would have to endure low levels of gravity for long periods of time, avoiding large doses of radiation, plus contending
B. Mars would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend
C. Mars, having to endure low levels of gravity for long periods of time, would also have to avoid large doses of radiation, plus contending
D. Mars, having to endure low levels of gravity for long periods of time, avoid large doses of radiation, plus contend
E. Mars, who would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend with
OA B
Source: Official Guide
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Travelers from Earth to Mars would have to endure low levels
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BTGmoderatorDC
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deloitte247
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Option A - Incorrect
This option lacks parallelism
Option B - Correct
Proper concise construction because parallelism is well spelt out in this option. Thus, make this the correct choice.
Option C - Incorrect
Here, we have two problems to tackle.
1. 'Having to' is wrong and even changes the meaning.
2. Parallelism exists. So, you can eliminate without doubt,
Option D - Incorrect
This is wrong because, by adding a comma and changing the verb to gerund 'having', this is now just one long run-on sentence. It is missing a verb!
Option E - Incorrect
Here, who is wordy because we do not need it as B is clearly giving the meaning without 'who'. Therefore, it is wrong
This option lacks parallelism
Option B - Correct
Proper concise construction because parallelism is well spelt out in this option. Thus, make this the correct choice.
Option C - Incorrect
Here, we have two problems to tackle.
1. 'Having to' is wrong and even changes the meaning.
2. Parallelism exists. So, you can eliminate without doubt,
Option D - Incorrect
This is wrong because, by adding a comma and changing the verb to gerund 'having', this is now just one long run-on sentence. It is missing a verb!
Option E - Incorrect
Here, who is wordy because we do not need it as B is clearly giving the meaning without 'who'. Therefore, it is wrong
