Bill likes to go to horse races. At the races, he notices that a certain breed of horse usually comes in first place, while a different breed of horse usually comes in last place. Which of the following is a testable scientific question that Bill could ask about his observations?
A.
Do faster breeds of horses have longer legs?
B.
Are some breeds of horses prettier than others?
C.
Do slower breeds of horses lack determination?
D.
Do some horses want to win the race more than others?