Answer:
The correct answer is the third option: Lawyer - Probation Officer - Firefighter
Step-by-step explanation:
First of all, the lawyer is the one who requires more years of schooling due to the fact that in order to be it the person must go to college after graduating from high school. Secondly, the probation officer is formed during years as well. And finally the firefighter is the one who does not need so many years of schooling because the person can go and have the training to be it right after he finished high school.