Answer:A. 150% of Ben's Social Security benefits.
Explanation:Social Security Benefits is a program managed by the SOCIAL SECURITY ADMINISTRATION (SSA),it is a Federal Government program that aims to support the Aged and retired workers in the United States of America. It also have a program for the Disabled people of the United States of America. According to the Enabling Laws, when both Ben and Carla have the Social security Benefits of getting 150% of Ben's social security benefits.