Final answer:
Land temperatures in the Northern Hemisphere fluctuate more than in the Southern Hemisphere due to the former having a greater landmass, not due to human development or atmospheric water vapor differences. The correct option is (c).
Step-by-step explanation:
Land temperatures vary more in the Northern Hemisphere as compared to the Southern Hemisphere primarily due to geographical differences rather than human development or atmospheric water vapor. The key factor is that the Northern Hemisphere contains more landmass, which heats up and cools down more quickly than the oceans that predominate the Southern Hemisphere.
This results in more extensive temperature fluctuations in the Northern Hemisphere. It is not due to the amount of human development or atmospheric water vapor in either hemisphere.