Auroras on Earth Are Caused by

Auroras on Earth are caused by

A) reflection of sunlight from the Arctic and Antarctic ice into the polar skies.
B) electrons accelerated by electric currents in the ionosphere and then deposited into Earth's atmosphere.
C) high-energy charged particles from the magnetosphere guided by Earth's magnetic field into polar regions of the atmosphere.
D) ultraviolet radiation from the Sun exciting and ionizing atoms in Earth's upper atmosphere to emit characteristic colors of light.