What enhances the success of a family planning program? 

A)  wide availability of contraceptives 
B)  apathetic leadership 
C)  having the majority of participants residing in the countryside 
D)  implementation by central planners

Wide availability of contraceptives ensures that individuals have access to the tools necessary to engage in family planning. Without this access, individuals may be unable to effectively control their fertility leading to unintended pregnancies and hindering the success of the program. Apathetic leadership, having the majority of participants residing in the countryside, and implementation by central planners do not have a direct impact on the success of a family planning program.