Observe the following statements. Select the correct one.

Options

A. Temperature increases progressively from equator towards the poles and from plain to mountain tops.
B. Temperature is sub-zero level in polar areas and high altitude and increase to above `50^@C` in tropical desert in summer.
C. In unique habitats such as thermal springs and deep sea hydrothermal vents average temperatures exceed `20^@C`.
D. Mango trees grow in temperate countries like Canada and Germany.