What element is quite helpful in preventing a place from getting warmer in higher latitudes

A．The woman is making movies with computers.
B．The man is studying fine arts as a major.
C．The woman has real talent for computer sciences.
D．The man still defends fine arts.

A．It is from second-hand information.
B．It is gathered from other sources than from its inhabitants.
C．It is from the arguments about the country.
D．It is different from what one had before the travel.