Most Biologists Consider Loss of Water from Plant Tissues to Be

Most biologists consider loss of water from plant tissues to be a negative thing;and in fact,many plants have features that reduce water loss.Yet,plants still transpire.Which of the following is the least likely explanation for the fact that plants continue to transpire?

A) Transpiration drives water flow through the plant,which is necessary for uptake and distribution of essential nutrients.
B) Transpiration must be occurring for photosynthesis to take place.
C) It is difficult to produce a means of gas exchange that doesn't also allow water loss.
D) Evaporative cooling during transpiration may help prevent leaves from overheating.