Not practicing hand washing or immunizations.
Answer: Eating to relieve tension or boredom can result in overeating. At the same time, if you lose your appetite when you are upset or bored, you may miss out on getting nutrients that your body needs.
I'm going to say B because the other answers just don't seem to make sense.
BMI of less than 18 is considered underweight... However, when considering BMI, you do want to take into consideration muscle mass, height, etc...
Over 35 is obese
I would choose A, because having a BMI less than 35, 30 or 40 wouldn't be a risk factor.