C. To play an active role in electing government officials is the correct answer.
Explanation:
According to the Merriam-Webster Dictionary, democracy is defined as "a government in which the supreme power is vested in the people and exercised by them directly or indirectly through a system of representation usually involving periodically held free elections." Based on this definition (and even though it is not the only role of people), the supreme power can be seen at its maximum when people elect government officials, so letter C is the correct answer.
