The correct answer is option 4: people suffering from `anorexia nervosa` eat very little and fear gaining weight. Anorexia nervosa is an eating disorder characterized by an intense fear of gaining weight, distorted body image, and an excessively restricted food intake. Individuals with anorexia nervosa often have a significant weight loss or are dangerously underweight. They may engage in extreme dieting, exercise excessively, or use other methods to prevent weight gain.

Option 1, developing paralysis, is not a characteristic of anorexia nervosa. Paralysis refers to the loss of muscle function, which is not directly related to this disorder.

Option 2, showing poor reflex, is also not a defining feature of anorexia nervosa. Poor reflexes may be caused by various factors, but it is not consistently associated with this particular eating disorder.

Option 3, not being able to speak properly, is not a symptom of anorexia nervosa. Speech difficulties could be caused by other conditions, but it is not directly linked to this disorder.

In summary, people with anorexia nervosa restrict their food intake and have a fear of gaining weight. They do not develop paralysis, show poor reflex, or have difficulty speaking properly as suggested in the