Bob,after a Long and Distinguished Career at a Nuclear Weapons

Bob,after a long and distinguished career at a nuclear weapons plant in the plutonium storage department,is hired by a local company to work in its warehouse.Bob's skin has turned bright green from his years around the plutonium,but he is otherwise healthy and is not radioactive in any way.All scientific and health experts have determined that his condition is permanent but harmless.After working in the warehouse,Bob does not receive a promotion,and Bob believes it is because of his green skin.Which of the following,if it is the true reason that Bob was not promoted,would give Bob the best chance of prevailing if Bob sues his employer?

A) A white worker was promoted because the white worker was simply a better warehouseperson.
B) An African-American worker was promoted because the African-American worker had worked longer for the employer, and his promotion was made on the basis of seniority.
C) Supervisors need to understand the company's computerized inventory system, but Bob could not learn the system, despite his best efforts to do so.
D) Despite the opinion of experts, some of the people Bob would be supervising thought he had some kind of disability, and they therefore did not want to work for him.
E) Bob had informed his boss that he was gay, and this was the reason he was not promoted.