The Two Plants Shown Here Have Been Watered and Fertilized

The two plants shown here have been watered and fertilized identically, and have been maintained in exactly the same light and temperature conditions. What is the difference between the plant on the left and the one on the right in the picture below?

A) the absence of mycorrhizal fungi in the soil on the left
B) the presence of mycorrhizal fungi in the soil on the left
C) the absence of honeybee pollinators in the soil on the left
D) the presence of honeybee pollinators in the soil on the right