A factor that could make elections to be free and fair is the?

A. existence of dependent electoral commission
B. adoption of a flexible constitution
C. opportunity for people to vote twice
D. registration of eligible voters

Correct Answer: Option D

D. registration of eligible voters

Explanation

For an election to be free and fair, eligible voters must be registered and certain civil liberties, such as the freedoms of speech, association, and assembly, are required.