9. Eating disorders are not only physical they are also the result of high self-esteem
bacterial infection
behavioral and emotional pressures
lack of sleep

Behavioral and emotional pressures.

Explanation:

We already know that high self-esteem would most likley not result in this, so we can kick that answer out.

A bacterial infection also wouldn't cause this, as it is psychological and  emotional based.

A lack of sleep wouldn't cause this either, most likely.

In the end, we hace behavioral and emotional pressures. This is correct because often when   someone goes into an eating disorder something psychological happened; whether is be peer-pressure, bullying or etc

the answer is,

c.) Behavioral and emotional pressures.

Explanation: