Vicki works as a medical transcriptionist. She is required to log in 40 hours in four days and take three days off. Vicki's work schedule is an example of

C; skin, is the answer!

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.

The answer is a.     hope this !