Which Statement Accurately Reflects the Impact of Social Class on Toilet

Which statement accurately reflects the impact of social class on toilet training?

A) The more education parents have, the later their kids tend to be toilet trained.
B) The less education parents have, the later their kids tend to be toilet trained.
C) Social class has no impact on when toilet training takes place.
D) Income rather than education level has more impact on the age at which toilet training takes place.