In a village in Africa, the same plot of land is planted year after year, and no fertilizers are used. What problem is likely occurring? A. slash and burn farming B. overgrazing C. overfarming D. deforestation Please select the best answer from the choices provided A B C D

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.