Environmental influences on personality traits are most clearly highlighted by comparing with

The correct answer is comparing identical twins raised together with identical twins raised separately.

Environmental influences may be easily seen when identical twins, who have been raised separately. This is because identical twins share the same genetic information, therefore they share characteristics of appearance and character. For this reason, the differences in aspects of personality that young people have can be attributed to the environmental influences they received throughout their lives.

I hope this information can help you.