What is the name of the electoral law that grants a bonus of up to 50 seats to the party winning the largest vote share?

• A simple proportional representation
• B alternative vote
• C single transferable vote
• D reinforced proportionality ✓

Greece's 'reinforced proportionality' system gives the first party a sliding bonus of up to 50 extra seats (out of 300), designed to produce stable majority governments; the exact formula has changed multiple times since 1974.