Which of the following best describes a lewis base?
a. it donates protons in solution.

b. it accepts protons in solution.

c. it donates electrons in solution.

d. it accepts electrons in solution.

Option (C) is the correct answer.

Explanation:

According to Lewis, a base is a substance or specie which is able to donate electrons.

For example, is a lewis base because nitrogen has a lone pair of electron.

Therefore, when ammonia is dissolved in HCl it will accept the hydrogen atom as nitrogen gave electron to the hydrogen atom. As a result, hydrogen bonds with nitrogen atom.

Thus, we can conclude that it donates electrons in solution best describes a Lewis base.