It would be C. clean eating, because a nutritionalist wouldn't care about campfire meals, or how long it takes to cook the meals, or how much money the meal costs, they just want to make sure it is healthy. Hope this helped! :)
The attitude an author has towards a particular subject is the mood.
Researching a researching i'm just writing more because its required
Was is not an action, so it's a linking verb.
