Rare Earth-Intensifying Screens Are Superior to Calcium Tungstate Screens in That

Rare earth-intensifying screens are superior to calcium tungstate screens in that rare earth screens are characterized by which of the following?

A) They are less expensive.
B) They require less radiation, resulting in shorter exposure time.
C) They eliminate distortion.
D) They have a built-in scatter control mechanism.
E) They produce less penumbra.