Marsha Is the Oldest Child in Her Family, Katina Is

Marsha is the oldest child in her family, Katina is the middle child, and Sally is the baby.Research suggests that:

A) No differences in intelligence should be expected as a function of birth order.
B) Marsha will likely have the highest intelligence score.
C) Katina will likely have the highest intelligence score.
D) Sally will likely have the highest intelligence score.