Read the paragraph.(1) The concerns about sending people to Mars is definitely worth considering. (2) For one thing, the mission will cost billions of dollars. (3) This would be a huge additional cost at a time when national debts continue to skyrocket. (4) Also, that money could help fix problems here on Earth.
Answer
A
Sentence 1 should be revised to change “is” to “are.”
B
Sentence 2 should be revised to change “will cost” to “costs.”
C
Sentence 3 should be revised to change “continue” to “continued.”
D
Sentence 4 should be revised to change “could help” to “helps.”
Explanation
In sentence 1, the subject is “concerns,” which is plural, so it needs the plural verb “are”: “The concerns about sending people to Mars are definitely worth considering.” The other verb forms are appropriate: “will cost” refers to a future mission, “continue” agrees with plural “debts,” and “could help” expresses a possibility.
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