Which One of the Following Alternatives Illustrates a Difference in Effortful

Which one of the following alternatives illustrates a difference in effortful control?

A) Meghan is good at keeping her impulses in check, whereas Jessie is apt to lash out at the slightest provocation.
B) Robert is always kind and considerate of others, whereas William typically thinks only of his own needs.
C) Lucia is often cheerful and outgoing, whereas Julie is more likely to be quiet and reserved.
D) Donald spends most weekends playing sports and in other ways being physically active, whereas Jasper is more likely to be found reading a good book.