Which Air Masses Influence the Humid Continental Hot-Summer Climates in North

Which air masses influence the humid continental hot-summer climates in North America?

A) continental polar (cP) and maritime tropical (mT) ,especially in winter
B) continental polar (cP) year-round
C) continental polar (cP) and continental tropical (cT) ,especially in summer
D) continental polar (cP) in summer and continental Arctic (cA) in winter.
E) continental Arctic (cA) year-round