Answer:
The answer is option F.
Step-by-step explanation:
The blocked fronts are framed when a chilly front, moving quicker, traps a warm front and fuses. Thus the two cool air masses, those of the warm front and those of the cool, come into contact and stay in the lower part, being denser. The warm air is compelled to rise, cools and causes serious rainfall. Once above, cooling proceeds by contact with cool air.