Which socioeconomic factory contributes most to an unhealthy diet, and why?

a. income level, because those with a lower income cannot afford more expensive fresh foods.

b. education level, because those with less education may not know the difference between healthy and unhealthy foods.

c. social status, because it has become fashionable to eat processed and fatty food.

d. occupation, because those with busy jobs often don't have time to eat a proper meal.