【单选题】Trying to get Americans to eat a healthy diet is a frustrating business. Even the best-designed public-health campaigns cannot seem to compete with the tempting flavors of the snack-food and fast-food...
A.
public-health campaigns cannot compete with tempting flavors.
B.
snack-food and fast-food industries are flourishing in the US.
C.
most food in America are profoundly rich in fat and sugar.
D.
fat people account for a large proportion of American population.