Why Are Seasonal Fluctuations in Atmospheric Much More Pronounced

Why are seasonal fluctuations in atmospheric much more pronounced in the northern hemisphere compared to the southern hemisphere?

A) The trees and other photosynthetic plants absorb atmospheric carbon dioxide in summer in the northern hemisphere but lose their leaves in fall and winter, and photosynthesis stops.
B) During the fall and winter in the northern hemisphere decay of the organic matter generates carbon dioxide, which increases the atmospheric levels by the spring.
C) Both A and B are true.
D) production is more limited in the area of our planet's largest land masses, which are located in the southern hemisphere.