Which is a complex sentence? A. The beautiful, complex bird calls helped me to
relax.
B. As soon as the rooster crowed in the morning,
I knew it was time to rise from my slumber.
C. I often tried to imitate the bird calls back to
them.
D. I could never whistle the tune that the birds
sang, but I could try.

1.  go out into nature and commune with the divine2.  experience real solitude to truly perceive nature3.  realize that individuals are meant to learn from nature and transcend it4.  think of nature as a symbol of the divine

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.