Which of the following plant science roles involves the largest number of people? a) botanist b) horticulturalist c) agronomist d) florist

I believe the answer is B. Horticulture
 Horticulture is the art and science of growing Vegetables, fruits, flowers, or other cultivar.
Compated to other field on the optiens above, horticultural field require the most manual labors and lesser scientists , which make it involves the largest number of people.