Movie Theaters Are Able to Offer Discounts to Senior Citizens

Movie theaters are able to offer discounts to senior citizens because:

A) the elderly deserve lower prices because of their contributions to society.
B) senior citizens have the most inelastic demand.
C) theaters can separate senior citizens from other customers,and it is easier to prevent resale.
D) senior citizens cannot see the movie very well anyway because of poor eyesight.
E) senior citizens should be given special privileges owing to their age.