One Way That Gardeners Found That They Could Make Extra

One way that gardeners found that they could make extra money, without growing their routes too large, was to

A) take on extra duties for the people they worked for, such as laying sod, seasonal cleaning, and planting annual bulbs.
B) take more money "under the table," in which the government or competitors would never know that they were getting this extra cash.
C) hire undocumented immigrants who would work for less money than their current employees.
D) All of the above.