sk8ternite wrote:Even in this age of conservation, cooking ranges that consume fossil fuels are far more common than those that rely on magnetic resonance, producing heat more efficiently than natural gas.

a. producing heat more efficiently than natural gas
b. producing heat more efficiently than natural gas does
c. which produce heat more efficiently than natural gas
d. which produce heat more efficiently than natural gas does
e. much more efficient at producing heat than natural gas

OA B

I picked D

riteshbindal wrote:

sk8ternite wrote:Even in this age of conservation, cooking ranges that consume fossil fuels are far more common than those that rely on magnetic resonance, producing heat more efficiently than natural gas.

a. producing heat more efficiently than natural gas
b. producing heat more efficiently than natural gas does
c. which produce heat more efficiently than natural gas
d. which produce heat more efficiently than natural gas does
e. much more efficient at producing heat than natural gas

OA B

I picked D

Here which can not be used because "which" modifies magnetic resource which is incorrect. We are left with A, B and E. A and E are incorrect due to parallelism. Both are comparing efficiency with natural gas. B is correct as it compares efficience of fossil fuels with efficiency of natural gas.