Cali and Cari are identical twins. Their parents want to make sure they have a chance to develop their own individual personalities, so they enroll Cali in soccer and Cari in dance. This is a reflection of the twins' __________.

A) genetic makeup
B) shared environment
C) nonshared environment
D) inherited circumstances

The fact that the twins' parents are enrolling them in different extracurricular activities suggests that they are trying to provide a unique and individualized environment for each twin to develop their personality. This falls under the category of nonshared environment, which refers to the unique experiences and environments that siblings experience separately from one another. The choice is not A because identical twins share the same genetic makeup. The choice is not B because the twins are still living in the same household and therefore share a lot of the same environmental influences. The choice is not D because inherited circumstances refers to things like socioeconomic status or family history of certain genetic disorders, which are not relevant to the situation described in the question.