Four-Year-Old Allan Has a Difficult Temperament

Four-year-old Allan has a difficult temperament. Four-year-old Ethan has an easy temperament. When they are older and enter school,

A) Ethan is more likely than Allan to have behavioural problems.
B) Allan is more likely than Ethan to have behavioural problems.
C) Allan and Ethan are both likely to have behavioural problems.
D) Allan and Ethan are both unlikely to have behavioural problems.