Aperson with high naturalist intelligence is most likely to succeed working as a(n):

A person with high naturalist intelligence is most likely to succeed working as a "conservationist".

A Conservationist works in the insurance of things, places, natural life and biological systems. They are utilized in an extensive variety of orders yet basically have a similar activity, conservation for who and what is to come or for the soundness of the biology or the planet. 

It’s either d or b ! but it might be b