Which of the following is best associated with a mt air mass?

a relief from warm humid summer conditions in the us northeast
b hot, dry summer weather in the us southwest
c cold, dry conditions in winter in the us southeast
d flooding rains in winter along the southern part of the us pacific coast

B hot, dry summer weather in the US southwest

Explanation:

A maritime air mass is associated with the warming of the air above the latitudes of United state's western and southern hemispheres. These winds bring warm, moist and unstable and originate in the Gulf of Mexico. Also, originate over the eastern Pacific in summer.  Thus due to the development of high-pressure areas over the northern hemisphere and thus winds move in the downward low-pressure areas.