Refer to the Information Provided

Refer to the information provided.Which of the following statements would weaken Billy's case against his employer?

A) the other employees have high-school certificates and Billy does not
B) Billy only works part-time and as a result has fewer hours of experience, even though he has been with the business longer
C) Billy complains of lower back problems and as a result frequently gets the easy job of holding the doors open while the movers carry the piano into the customer's house
D) all of the above