Final answer:
The correct answer is D. Mandatory Voting. All of the other options listed, A. Ranked-Choice Voting (RCV), B. Proportional Representation (PR), and C. Single Transferable Vote (STV), are reform proposals for electoral mechanics.
Step-by-step explanation:
The correct answer is D. Mandatory Voting. All of the other options listed, A. Ranked-Choice Voting (RCV), B. Proportional Representation (PR), and C. Single Transferable Vote (STV), are reform proposals for electoral mechanics. Ranked-Choice Voting (RCV) allows voters to rank their choices, Proportional Representation (PR) aims to ensure that the proportion of seats in a legislative body corresponds to the proportion of votes received, and Single Transferable Vote (STV) allows voters to rank candidates and transfer their vote to other candidates.