Different areas of Earth's oceans receive different amounts of energy in the form of heat. What is the main source of this energy?
A. kinetic energy from tides
B. kinetic energy from ocean currents
C. energy transfer within Earth's crust
D. electromagnetic radiation from the sun

It’s actually still in the u.s.

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.