Answer:
D) Petroleum Engineer
Step-by-step explanation:
A power line repairer only needs an associates degree (2 years of college). Nuclear Power Reactor Operator only needs a high school degree (more or less) An Electrician only needs a high school degree (more or less) And Petroleum Engineers have a Bachelors degree aka 4 years of college.
Sorry if I was to late to answer your question but I hope it can at least help someone else :)