Ellen and Fred Work on the Loading Dock for Grange

Ellen and Fred work on the loading dock for Grange Storage. Ellen, who has a disability, requests a transfer, which would represent an accommodation for her disability. But when an opening occurs, Grange transfers Fred on the basis of seniority. In Ellen's suit against Grange for discrimination, most likely

A) ​Fred's seniority is a good defense.
B) ​Ellen's disability is a sufficient basis for relief.
C) ​Grange's action was a business necessity.
D) ​Grange's action was a reasonable accommodation.