Which job is likely to have the highest income?

A.
a job that many people are willing to do

B.
a job that requires low productivity

C.
a job that calls for highly specialized skills

D.
a job that most people would be able to do

C. A job that calls for highly specialized skills is likely to have the highest income as this requires years of education, training, and experience, which results in a limited number of people who can perform such work, making it more valuable and command higher pay.