Regarding tropical rainforests, the term evapotranspiration refers to the fact that

A. deforestation causes a decline in atmospheric oxygen.
B. the humidity of rain forests can produce local and regional precipitation
C. deforestation causes a loss of soil fertility due to water evaporation.
D. trees absorb carbon dioxide and "exhale" oxygen.
My answer is B Could you please correct if answer is wrong

Right.

http://www.rainforestconservation.org/rainforest-primer/rainforest-primer-table-of-contents/j-rainforest-role-in-the-water-cycle/

Your answer is correct. Evapotranspiration in tropical rainforests refers to the process by which plants release moisture into the atmosphere through transpiration, and this contributes to the high humidity in rainforests. The high humidity, in turn, can lead to local and regional precipitation. Therefore, option B is the correct answer. Well done!