Greg and Stanley Are Both Five Years Old

Greg and Stanley are both five years old.Greg has a greater attention span than Stanley,and he is able to persist in tasks much better than Stanley.According to some research on attention,

A) Greg is likely to have higher intelligence scores than Stanley,but not outperform Stanley in school achievement.
B) Greg is likely to have higher intelligence scores than Stanley as well as display greater achievement in school.
C) Stanley is likely to show catch-up growth and will have intelligence scores similar to Greg's once they enter school.
D) Stanley will probably have lower intelligence test scores than Greg,but he will achieve about the same level of academic achievement and have better social skills.