Which of the following results in pulling of water, molecules by molecule, into leaf from xylem? 

Evaporation through stomata results in pulling of water, molecules by molecule, into leaf from xylem.
When water is lost from the leaf through transpiration (primarily through stomata), it creates a negative pressure or tension in the leaf. This negative pressure is transmitted through the water column in the xylem of the plant, which is a continuous network of interconnected vessels. As water is lost from the leaf, it is indeed "pulled" up through the plant. This process is known as the transpiration pull or cohesion-tension theory.