Mark Was Refused Employment at a Christian Bookstore Because He

Mark was refused employment at a Christian bookstore because he was not a "born-again Christian." If Mark brings a Title VII action against the bookstore,the bookstore's best defense would be

A) it did not discriminate against a protected category.
B) Title VII doesn't apply to private businesses.
C) being a "born-again Christian" is a bona fide occupational qualification.
D) it could not reasonably accommodate Mark.