Belinda's Religion Prohibits Paying Union Dues

Belinda's religion prohibits paying union dues. She was recently hired as a truck driver by Open Highway Transportation, Inc., where all drivers belong to a union and all newly hired drivers are required to join within 90 days of accepting employment. Belinda refuses to join the union and asks that the requirement be waived for her. The union refuses and requests that Open Highway terminate Belinda. Belinda will not be entitled to accommodation of her religious beliefs

A) because it will open the door for employees who simply don't like unions to voice disingenuous religious objections to avoid paying fair-share fees.
B) because she should have asked about union security requirements when she applied for the job.
C) if the union can establish hardship by showing that that Belinda's request is part of a widespread refusal to pay union dues.
D) because this violates the Establishment Clause ensuring governmental neutrality in matters of religion.