Because of rising corn prices, investment in ethanol as an

Even 'B' uses same construction

The critical difference between B and D is the use of proper idiom, as risky as; as per grammar, comparison started with as should be completed with as. So B loses out to D

The "as" in "ethanol as an alternative energy" is used to describe ethanol. It is not part of the "as...so..." construction.

btw, will this type of questions be on the GMAT? Since they have supposedly tone down on questions on idioms?

Thanks guys got rite now..
I need to reduce to stem to get clear idea

Because of rising corn prices, investment in ethanol as an alternative energy is so risky, and for some investors even riskier than what hydrogen fuel cells are predicted to be

A) so risky, and for some investors even riskier than what hydrogen fuel cells are predicted to be--no logical meaning

B) so risky, and for some investors even riskier than, investment in hydrogen fuel cells--should be "as risky as"

C) as risky, and for some investors even riskier than, hydrogen fuel cells---distorts the meaning and no proper idiom

D) as risky as, and for some investors even riskier than, investment in hydrogen fuel cells--correct

E) as risky as, and for some investors even riskier than, hydrogen fuel cells--distorts the meaning

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