In Regard to Worker Income and the Abundance of Labor

In regard to worker income and the abundance of labor, Adam Smith:

A) found them positively related (that is, higher wages led to a greater willingness to work) .
B) found no relationship between income and willingness to work.
C) felt that higher wages encouraged workers to be more active, diligent, and expeditious.
D) only a and b above
E) only a and c above