Although Maximizing Route Size Was a Way to Grow Business

Although maximizing route size was a way to grow business and make more money, why was this not a preferred strategy for many Mexican gardeners working in Los Angeles?

A) They lack the entrepreneurial, business, and accounting skills to manage a large number of employees and customers.
B) Since this is a business that mostly paid in cash, they had no way of keeping track of the money coming in, once their routes became too large.
C) Over time, gardeners found that customers were getting cheaper in how much they would pay and their employees were becoming less reliable, making it more difficult to run a profitable business.
D) Gardening is hard work and these men found that if their businesses grew too much they could not handle the physical toll it took on their bodies.