Miranda Is a Cashier at Super Store

Miranda is a cashier at Super Store.Saturday is their busiest day.She tells her supervisor Sam that she needs to be off every Saturday because that is the religious holiday for the religion to which she has recently converted.What are Sam's obligations to Miranda?

A) He has an absolute obligation under the law to let her off every Saturday unless he can prove that she is not using the time for religious observance.
B) He cannot fire her based on her religious beliefs, but he has no duty to let her off on the busiest day of the week.
C) Under the law, he must allow her to be off as requested, but only if she can establish that under the tenants of her religious beliefs she is doomed if she does not attend worship services regularly.
D) He must make reasonable accommodations for her unless doing so would cause undue hardship on the business.