Why anorexia nervosa increases?

Bulimia nervosa is characterized by a. a refusal to eat enough food to maintain normal, healthy body weight and/or the use of measures to produce severe weight loss. b. high fat intake and low level of physical activity. c. alternating binge eating and purging through vomiting, laxatives, or diuretics. d. normal food consumption interrupted by episodes of high consumption, resulting in obesity.

Which factor is capable of influencing your sense of self? options: a) social environment b) intelligence c) profession d) social standing

Ireally need to know this answer asap