Final answer:
Capillary action facilitates water uptake by plants by allowing water and dissolved nutrients to be transported from the soil up through the roots and into the plant.
Step-by-step explanation:
Capillary action is the process by which water is drawn up through small tubes, such as the xylem vessels in plants. This process helps facilitate water uptake by plants (option B) by allowing water and dissolved nutrients to be transported from the soil up through the roots and into the plant. Capillary action is based on the adhesive forces between the water molecules and the walls of the tubes, which allows the water to climb up the tubes against gravity.