Plants in the rainforest
a. effectively conserve and retain water
b. have low levels of transpiration
c. release 50-80% of their water back into the ecosystem
d. are adapted to conditions of drought

The answer us (c.) release 50 - 80% if their water back into the ecosystem.

Rainforest are the types of forest where the level of rainfall is high making them abundant in moist. Plants living in this type of ecosystems release their water back into the ecosystem. The Amazon rainforest has 50 - 80% of the moist remains in the ecosystems with the help of the plants through the process of transpiration during the photosynthesis. 

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy