Which of the following scenarios would provide the best evidence that human traits are a result of lifestyle choices?

A.
Matt had been naturally right-handed since birth. In high school, he decided to start throwing left-handed after reading that there was a shortage of left-handed pitchers in the major leagues. Matt is now left-handed.
B.
Lisa and Anita are identical twin sisters. Lisa went grew up in New York; Anita grew up in Florida. Both sisters used to catch cold easily, but now, Lisa does not. Both sisters used to sunburn easily, but now, Anita does not.
C.
Tanya's mother has blonde hair. Tanya's father has black hair. Tanya's hair is brown.
D.
Arnold's parents and grandparents all have heart disease. Although Arnold has always exercised, avoided unhealthy foods, and followed doctor's instructions, he also has heart disease.