Which of the Following Presents the Best Example of Chance

Which of the following presents the best example of chance influences on nonshared environment during personality development?

A) Keiko decides to join the math team because her teachers happened to focus heavily on math scholarship.
B) Jeffery is obsessed with soccer because his father happened to be a professional player.
C) Alexis is angry most of the time because of her irritable temperament.
D) Sanjay has considered himself artistic ever since his best friend's mother began teaching him to paint.