Americans' Body Weight Has Increased Over the Last Century,but the Amount

Americans' body weight has increased over the last century,but the amount of this change varies according to socioeconomic status,inasmuch as:

A) lower-income families tend to consume less protein and fiber,and more saturated fat and sugar.
B) higher-income families tend to eat more high-fat foods because these foods are more expensive.
C) the modern "Western" diet is very high in protein.
D) diets are similar across groups,but activity levels are lowest in higher-income families,so they have more body fat.