Criminal justice officials had frequently complained that their jobs were made by the practice, once common in many states, of sealing juvenile court records.

more difficult.    

Explanation:

Criminal justice officials had frequently complained that their jobs were made more difficult by the practice, once common in many states, of sealing juvenile court records.  This is so because, it becomes difficult for law enforcement officers to keep track on previous offender such as juvenile offenders who may likely commit crimes again in the future.

i think it's b or c hope this

manifest functions are the recognized and intended consequences of any social pattern, while latent functions are those unrecognized and unintended consequences. to analyze the manifest functions of any social institution, we have to study its contribution to the continuation of a group, community, or society.