According to Duverger's Law, which of the following voting systems will eventually result in a two-party system?

Question

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Duverger's Law states that the first-past-the-post voting system will eventually result in a two-party system. This is because voters tend to strategically vote for one of the two major parties to avoid "wasting" their vote on a third-party candidate who is unlikely to win under the winner-takes-all system of FPTP. In contrast, PR systems (open-list, closed-list, and mixed) tend to encourage the representation of multiple parties, as seats are allocated proportionally based on the total number of votes each party receives.

According to Duverger's Law, Which of the Following Voting Systems