As a Child, You Received the OPV Vaccine and Its

As a child, you received the OPV vaccine and its boosters.Now you are going on a mission trip to Pakistan, and the vaccine is recommended by the Centers for Disease Control and Prevention.When you go to the health office for the vaccine, they give you the IPV vaccine.When you ask why you are receiving the IPV rather than the OPV, the personnel explain that

A) there is no possibility of actually developing polio from this vaccine.
B) IPV is used as a booster only, and OPV is used exclusively for children's first immunization.
C) the IPV has fewer active viruses in it than the OPV, so it is safer.
D) the IPV is preferred by patients because it can be taken orally.