Answer:
Option A, t is the evaporation of water from leaf stomata, which helps in xylem transport.
Step-by-step explanation:
Transpiration is the process in which water is taken up by the plants from the roots and then it is transported to the leaves and then released to the atmosphere. The leaves have stomata at their bottom , which opens up and release the water in the form of vapour. In Xylem transport , water is transported from the roots to all part of the plant body, since water transportation is involved in transpiration process , it is said to be helping in xylem transport.
Thus, option A is the correct answer.