Which Would Be Most Likely to Be Found a Violation

Which would be most likely to be found a violation of Title VII?

A) An employee refuses to sign an agreement to "value" homosexual behavior that violates his religious beliefs, though his behavior is not discriminatory.
B) An employee refuses to remove offensive posters from his workplace in an attempt to change others' behavior and attitudes toward homosexuality.
C) An employee asks a co-worker why she wears a hijab.
D) An employer allows open and voluntary participation in an after-work prayer group on the premises.