Which is an example of plasmas in nature?

a. solar cells
b. plasma balls
c. auroras
d. clouds

c. auroras

(my answer was deleted for some reason by staff? idk)

The correct answer is option C.

Explanation:

Plasma is the state of matter composed of ionized gas which formed by providing energy to gases so as to free the electrons from the their respective atoms.

Auroras are reddish greenish lights in the sky which are seen near the southern and northern magnetic pole. This effect is due to the interaction between the charge particles from the sun and gases present in Earth atmosphere.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.