sexual-harassment court cases

“When the workplace is permeated with discriminatory intimidation, ridicule and insult that is sufficiently severe or pervasive to alter the conditions of the victim”s employment and create an abusive working environment, Title VII is violated.” This is a statement made with regard to which of the following sexual-harassment court cases?
A. Oncale v. Sundowner Offshore Services
B. Harris v. Forklift Systems, Inc.
C. Faragher v. City of Boca Raton
D. Burlington Industries v. Ellerth