If earth was not spinning there would be no

a. diurnal cycle
b. seasonal cycle
c. insolation
d. albedo

It's D --> Diurnal cycle

Explanation:

Actually, if the Earth's rotation stopped completely (not just "synchronous rotation") there would be a day-night cycle. The periods of light and dark would typically be 6 months long.

Also, there would probably no longer be the Earth's magnetic field.

Also, the ocean tides would (more or less) stop.

answer an inhibitory neurotransmitter in the brain;