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
I'm also confused between B and D.
As per my analysis, there are two comparisons:
1. Which is more common - Cooking ranges that consume fossil fuel (natural gas) and Cooking ranges that consume magnetic resonance
2. Which produces heat more efficiently - Natural gas (fossil fuel) or Magnetic Resonance
Problem with D is that which (MR) is singular subject and produce (plural verb) heat more efficiently than natural gas does - therefore S-V disagreement
With B - I'm confused because ", + verb-ing" is result modifier modifying the doer - Cooking ranges that consume MR which is not correct comparison
GMATNinja ,
daagh Sir, please help