Which of the following best describes the findings of Arvey et al's (2006) twin study of leadership?
1) The results suggest that although genetics plays a role, much more of the variance in leadership occupancy was determined by nonshared environmental factors.
2) The results suggest that although genetics plays a role, much more of the variance in leadership occupancy was determined by shared environmental factors.
3) The results suggest that leadership occupancy is primarily determined by environmental factors.
4) The results suggest that genetics plays no role in determining leadership occupancy.