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could someone please explain the answer to this question

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could someone please explain the answer to this question

by trustkip » Thu Nov 14, 2013 9:48 pm
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
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by AbhiS » Fri Nov 15, 2013 9:56 am
IMO - D

B, C & E out for use of Economical

A - Is implying thats demographers have to know - Its not must, its not a rule.
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by pareekbharat86 » Fri Nov 15, 2013 9:52 pm
trustkip wrote:To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical
Is it D? I think it should be D. B,C,E use 'economical' instead of economic'. Would have to know is the correct tense. So eliminate A.
Thanks,
Bharat.
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by [email protected] » Sat Nov 16, 2013 12:44 am
Hi All,

This SC comes down to Comparison rules, which means that Parallelism will also need to be considered.

1) The comparison is between what demographers "would have to know" vs. "what they know now." Eliminate A, B and E.

2) The parallelism is between "social" and "economic" (not "economical"). Eliminate C

Final Answer: D

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by guptas » Sat Nov 16, 2013 10:38 pm
I came down to between B and C.
A and D because of "economic"
E doesn't make sense. We need "they do now" not just "now" to get the clear sense of the sentence.

B seems to be like a order stating you have to know. But C seems to suggest: you would have to know.

I chose B as my answer.
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