This disease is Multiple Sclerosis.
hope this helps!
Maybe A, B, and D, this could be wrong but my best guesstimate
The answer is A which is CH4.
A phospholipid is made of glycerol, two the fatty acid tails, and a phosphate-linked head group. More unsaturated fatty acids it means less tightly packed phospholipids its results to the greater membrane fluidity. Unsaturated fatty acids are naturally occurring, meaning that the remaining hydrogen is on the same side of the molecule and result in a bending of the hydrocarbon chain.
Starch is made up of alpha glucose. Fiber and Cellulose is made up of beta glucose.