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.

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Isay b but i'm not sure. 

It is meant that like tapestry scientific theories often need to pull out since they are not relevant and often times the whole chain of theories may be pulled out.