The following statement best describes what type of air mass: warm and moist air

A. Continental polar
B. Maritime polar
C. Continental tropical
D. Maritime tropical

Maritime

Explanation: Maritime air masses form over water and are humid. Continental air masses form over land and are dry. Therefore, an air mass that develops over northern Canada is called a continental polar air mass and is cold and dry. One that forms over the Indian Ocean is called a maritime tropical air mass and is warm and humid