Scientific involves the work of many people exchanging, debating, testing, and retesting problems and hypotheses to improve our understanding of natural processes because 100 percent proof in science is not common.

You don’t list any options but the one that frets overspending and the consequences of that.

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.