A sector wise profession is defined as a profession that is specific to a particular job sector.
I believe that would be B
Primary sources can be described as those sources that are closest to the origin of the information. They contain raw information and thus, must be interpreted by researchers. Secondary sources are closely related to primary sources and often interpret them.
I'd say Inuit, but it could be Danish too! I'll look it up
EDIT : They are mostly Inuit