GMAT Sentence Correction (SC) | Re: Two new studies indicate that many people become obese more

(A) due to the fact that their bodies burn calories too slowly than overeating
MORE "due to the fact that X" than "overeating" - is not parallel construction

(B) due to their bodies burning calories too slowly than to eating toomuch
MORE "due to their bodies" THAN "to eating" - is not parallel in structure

(C) because their bodies bum calories too slowly than that they areovereaters
MORE "because X" THAN "that they" - is not parallel...