when would the following conditional be false?

if you work 20 hours a week, then you make $125.00.

a. you work 25 hours a week, and make $125.00.
b. you work 25 hours a week, and you make $175.00.
c. you work 20 hours a week, and you make $175.00.
d. you work 20 hours a week, and you make $125.00.

The following conditional would be false when option b is true.

In option b, it is stated that "you work 25 hours a week, and you make $175.00." This contradicts the original conditional statement which states that if you work 20 hours a week, then you make $125.00.