How has economic growth in the Canadian Shield region of Canada caused environmental issues in the country? A Manufacturing activity in the region has caused acid rain. B Overfarming of land in the region has made much of the soil infertile. с C Mining in the region has polluted many sources of freshwater. O Accidents at nuclear plants in the region have destroyed natural habitats.​

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.