Because People of the Same Age and Sex Live in the Same

Because people of the same age and sex live in the same historical times and select from similar societal options,

A) unrelated pairs of students of the same age and sex will appear very dissimilar on most traits.
B) you will find several children with the same first name in nearly every elementary classroom.
C) children in today's elementary classrooms will show significantly more differences and less similarities than they did 50 years ago.
D) twins reared apart will always be significantly more similar than unrelated pairs of students.