My analysis of this question :
Meaning - It has been discovered that grape enriched diet can result in three things - 1) lower BP 2) Better heart function 3) show fewer signs of heart muscle damage.
Error analysis - Original answer option does not maintain parallelism i.e. lowering BP not parallel to better heart conditions and fewer signs
POE :
(A)can result in lowering blood pressure, better heart function, and fewer signs ----> Wrong for the reasons mentioned
(B)can result in lowering blood pressure, better heart functioning, and less signs ----> Wrong for the reasons mentioned ; less is wrong here. Since signs can be counted, we must use few.
(C)can, as a result, lower blood pressure, improve heart function, and fewer signs ----> as a result is redundant
(D)can result in lower blood pressure, better heart function, and fewer signs ----> Correct !
(E)can result in lower blood pressure, better heart function, and less signs ----> less is wrong here.
Folks, please correct me if I am wrong !