Concerning the Minnesota Reunited Twin Studies, Which of the Following

Multiple Choice

Concerning the Minnesota reunited twin studies, which of the following aspects of their lives would be more likely to be due to genetic similarities than to living in the same historical time period?

A) both twins liking banana splits and cheeseburgers
B) both twins being Democrats
C) both twins having a nervous tic, like nail biting
D) both twins having joined the National Guard