You are presented with the question "What can cause the immune system to not work properly?" and the following answer choices: 
- cigarettes
 - Malnutrition
 - burning coal
 - Healthy food
 - Exercise
 - Good health
 - Allergies
 - Pesticides

Now knowing that immunodeficiency occurs when the immune system is not working properly and malnutrition , particularly with lack of protein , can cause acquired immunodeficiency, choose the best answer.


 

  Malnutrition       