What is this answer x3 = 27 ?

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

Alow-pressure belt means the air is cold and dry warm and rising cold and sinking warm and moist

What is the correct order (starting from the surface) of warts layers