fill in the blank

Which one of these careers ____ to six-figure salary?

a. lead
b. are leading
c. leads
d. have led

c <--

edit:

which one of these careers ______ to a six-figure salary?

c <--

Yes. C is right.

Correct! The correct answer is "c. leads."

To determine the correct answer, you should consider the subject-verb agreement. Since the subject "one" is singular, it should be followed by a singular verb form. In this case, "leads" is the correct singular form of the verb "to lead." The phrase "leads to a six-figure salary" means that the career mentioned results in a six-figure salary.