Self-starvation in purging type anorexia nervosa/binge-eating is linked with

The correct option is "regularly engaging in purging activities to help control weight gain".

To understand why this is the correct answer, it is helpful to look at the diagnostic criteria for anorexia nervosa, specifically the binge-eating/purging subtype.
Anorexia nervosa is characterized by a restriction of energy intake leading to a significantly low body weight, an intense fear of gaining weight or becoming fat, and a disturbance in the way one's body weight or shape is experienced.

The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) distinguishes between two subtypes of anorexia nervosa:
1. Restricting type: During the last 3 months, the individual has not regularly engaged in episodes of binge eating or purging behavior (e.g., self-induced vomiting or the misuse of laxatives, diuretics, or enemas). Weight loss is accomplished primarily through dieting, fasting, and/or excessive exercise.
2. Binge-eating/purging type: During the last 3 months, the individual has regularly engaged in episodes of binge eating or purging behavior (or both).

Therefore, self-starvation in the purging type of anorexia nervosa/binge-eating is directly linked with regularly engaging in purging activities (such as self-induced vomiting, misuse of laxatives, diuretics, or enemas) to help control weight gain in addition to the restriction of food intake.