Step 1: Explain the phrase.
It means every eligible citizen’s vote carries equal weight in electing representatives—no vote counts more than another.
Step 2: Category mapping.
This is a {political} concept tied to democratic participation and representation, not social status, wealth, or court treatment.
Step 3: Eliminate distractors.
Social and economic equality deal with status/income; legal equality means equal treatment before law—but the question points to electoral equality.
Step 4: Conclude.
\[
\boxed{\text{Political equality (Option A).}}
\]