We can see a few drops on leaves in the early morning. This is due to ________

We can see a few drops on leaves in the early morning. This is due to guttation.

Guttation typically happens when there is active water absorption by roots and transpiration is low, which is when there is moist and damp soil, high humidity, and relatively chilly air.
The surface of a leaf has microscopic pores known as stomata. Transpiration comes to a complete stop in the dark. Since the root continues to absorb water throughout the night, pressure (referred to as root pressure) builds up in the leaves and forces water out of special structures called hydathodes, which are found along the leaf margin and produce the water droplet that we occasionally see along the margins of leaves in the early morning.

Hence the correct answer is option B.