The average temperature of a region is primarily influenced by:
I. Distance from the equator - The closer a region is to the equator, the warmer it generally is. III. Height above sea level - Higher elevations tend to be cooler than lower elevations. IV. Proximity to large bodies of water - Water moderates temperature, influencing the climate of nearby regions.
II. The quality of the soil does not substantially affect average temperature.
Based on this analysis, the correct answer is:
A. I, III, and IV only.