"Underprivileged people" is often used by the mass media as a substitute for "poor people" Linguistically, the former is referred to as a(n) ______.

A．fresh water can be drilled from underground desert aquifers
B．the water drilled from the underground desert aquifers is only one-tenth as salty as sea water
C．the water drilled from the underground desert aquifers contains more nutritious elements than fresh water
D．the water drilled from the underground desert aquifers is not as hot as the sea water