One reason that perceived similarity may increase is that it

The answer to this question is provides a meaningful connection between the helper and the person being helped
People are more likely to helo other if we feel there is a connection between us and that other people, whether it's friendship, race, same birthplace, hobbies, education place, etc.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.