The social convoy model of social relations is best described as a personal network of individuals to whom one gives and from whom one receives:

B) .. change at different rates to different degrees

C) germany is the anwser

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.

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