Which of the Following Conditions Is Most Likely to Lead

Which of the following conditions is most likely to lead to the development of tornadoes?

A) Cool,stable air associated with interior,mountain regions
B) Warm,stable air associated with continental interiors
C) Cold front lifts a warm front leading to turbulence
D) Cold front lifts another cold front leading to alternating patches of stable and unstable air
E) Warm dry front lifts a cool maritime front leading to turbulence