What is a trading city?
Select one:

a. A city where people are trained in a certain skill, or trade.

b. A city that is the center of a slave trade.

c. A city with an economy that is almost entirely dependent on export and international trade.

d. Any city that is involved in international trade.

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.

Ithink it is b  employees