I think it’s B. hope this helps, sorry if it doesn’t.
It helps in solidifying the DNA which makes it visible.
When double bonds occur they are almost always cis. If there is more than double bond, they occur at three-carbon intervals, e.g., -C=C-C-C=C-. This is called the divinylmethane pattern.
I think you are referring to leaves of plants? If so, the leaf will wither in case it loses water and it will not get to nourish and retain hydration in its leaf body. Also, the water is a very vital element when it comes to producing food for the plant itself.
