Trying to influence someone to make healthy decisions describes the health skill of

Advocacy  
it involves rendering of service to the people or family and in addition to acts that elevate wellbeing and access to medicinal services in groups to the general populace. Backers bolster and advance the privileges of the patient in the social insurance field, help assemble ability to enhance group wellbeing and upgrade wellbeing strategy activities concentrated on accessible, protected and quality care

Athink is the answer c