Ideal Source Region of Air Masses?

Question

An ideal source region of air masses should be

A. located at or near a pole
B. Small
C. Physically uniform
D. roughly half land, half water
E. located at or near the equator

Answer 1

C. Physically Uniform

Answer 2

C. Physically uniform
An air mass is a considerable volume of air with similar characteristics throughout. This means that it was influenced by similar conditions all over its area of formation. If conditions were not uniform only a small area would have consistent conditions.
It takes a large area with similar conditions everywhere in it to produce an air mass.