Final answer:
When a grower plants a tall, thick hedge upwind of a crop field to create a microclimate, the hedge will reduce the wind speed of the field, reducing the amount of wind the plants experience.
Step-by-step explanation:
The correct answer is D) Wind Speed. When a grower plants a tall, thick hedge upwind of a crop field to create a microclimate, the hedge will reduce the wind speed of the field, reducing the amount of wind the plants experience. The hedge acts as a barrier that slows down the movement of air, creating a sheltered area behind the hedge where the crops are protected from strong winds.