What problems do desert plants and rainforest plants have in regards to water and how have they adapted to deal with these problems

The desert plants ans the rainforest plants both have problems with water, just that they are total opposite ones. The desert plants have problems because they do not have enough water. In order to cope with that, these plants have developed methods through which they are able to retain water and not a single drop to evaporate from them. They also are able to take in water from the air, and have enormous root systems. The plants in the rainforests have problems with too much water, so they have adapted very wide leaves so that the water doesn't go toward their roots. The roots also are able to restrict the intake of water, while the plants themselves have extremely high tolerance to water. They also have developed larger pores on their leaves in order for the water to evaporate more easily from them.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.