Read the excerpt from "Healthy Eating."

"If anything gets in the way of our good eating, it's lifestyle. When you get home from work late, why spend an hour in front of the stove when you can spend two minutes at the microwave? And doesn't that oatmeal box claim to be a good source of calcium for our kids, never mind the small print listing 14 grams of sugar? A small soda at the movies could satisfy a family of four. Even schools have vending machines."

What does the author think is responsible for people's poor eating habits?

A. They do not know how to correctly read the nutrition information on food packages.
B. They do not know how to prepare healthy meals that are both inexpensive and quick.
C. They often choose foods that are quick and convenient instead of ones that are healthy.
D. They spend time thinking about work and entertainment instead of thinking about food.