A new genetically engineered papaya was produced not by seed

Question

A new genetically engineered papaya was  produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but  university and United States Department of Agriculture researchers who allowed growers to use it free of charge.

A) produced not by seed companies who have been motivated by profit, which was the case with most genetically modified crops previously approved for commercial use, but 
B) produced not by profit motivated seed companies, the case with most genetically modified crops previously approved for commercial use, but 
C) produced not by profit motivated seed companies, as was the case with most genetically modified crops previously approved for commercial use, but by
D) not produced by profit motivated seed companies, which was the case with most genetically modified crops previously approved for commercial use, but was produced by 
E) not produced by seed companies who have been motivated by profit, the case with most genetically modified crops previously approved for commercial use, but by

abhijit_sen · Answer

IMO C.
Produced Not by X But by Y.
Others are violating this parallelism.

pmenon · Answer

C for me as well. You need the 'not X but Y construction'

rao · Answer

IMO C. Concise

"seed companies who have been motivated by profit" can be replaced by profit motivated seed companies

A new genetically engineered papaya was produced not by seed

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