Vitamin A is a fat soluble vitamin that is also a powerful antioxidant. Vitamin A plays a critical role in maintaining healthy vision, neurological function, healthy skin, bone growth, reproduction and immune system health and it also helps with skin and mucous membranes repel bacteria and viruses
soap is an alkali so is water, so using these two to wash your hands kills the bacteria because their defense system is a lot stronger than the bacterium cells. i hope i helped well.
The answer is A, hope this helps