Answer:
The correct answer is letter "B": rider.
Explanation:
While talking about insurance, riders are provisions added to the regular coverage for life, home, or auto policies. The insured can request adding the rider under a determined fee which is usually low because there is little underwriting involved. Riders are customizable amendments that fulfill very specific needs of the policyholders.
In Maggie's case, a rider was added to protect her in the case she becomes disabled because she is concerned that event can happen.