Answer:
c) single-member district systems result in two-party systems.
Explanation:
Duverger’s Law -
This law was given by the french sociologist , Maurice Duverger in 1950s ,
according to law , the single - member districts tends to favor the two - party system , but in the proportional representation and the double ballot majority system tends to favor the multipartism .
Hence , from the statements given in the question , the correct statemnet fro the Duverger's law is ( c ) .