The answer is C. Squamous
Well you can cancel a few out...
cook - no, I mean you're just cooking you may not know a lot about nutrition
epidemiologist - they determine diseases and such, so no.
Dietitian - Yes, expert in nutrition
Health Educator - I mean maybe, but they may not know anything about nutrition
Are there choices?
Otherwise if she-
Makes a chart
Finds healthy food she likes
Makes time to exercise