b. Jason may choose to do the talks other workers find undesirable
c. Jason's amiable personality allows him to work well with his co-worker
d. None of the above is correct.
a. Jason works harder than the other employees
In this scenario, the statement that would strengthen Jason's case would be that he works harder than the other employees. If Jason is able to provide proof of this then that would indicate that effort and work-efficiency is not the reason for Jason not receiving a wage increase. This would mean that the reason is either personal or superficial which are all labor-market discrimination. Therefore, if Jason can prove that he does actually work harder than the other employees it would drastically increase his chances of winning the court case against his employer.