The source is from the GMAT Prep
Officials at the United States Mint believe that the Sacagawea dollar coin will be used more as a substitute for four quarters than for the dollar bill because its weight, only 8.1 grams, is far less [/u]than four quarters, which weigh 5.67 grams each.
a. more as a substitute for our quarters than for the dollar bill because its weight, only 8.1 grams, is far less than
b. more as a substitute for four quarters than the dollar bill because it weighs only 8.1 grams, far lighter than
c. as a substitute for four quarters more than for the dollar bill because it weighs only 8.1 grams, far less than
d. as a substitute for four quarters more than the dollar bill because its weight is far lighter than it is for
e. as a substitute more for four quarters rather than for the dollar bill because its weight, only 8.1 grams, is far less than it is for
Is the difference between answer choices "c" and "e" simply a matter of concision? Or is there something grammatically wrong with answer choice "e"