How Do Systems of Representation in Other Democracies Differ from the System

How do systems of representation in other democracies differ from the system for congressional elections in the United States?

A) Other democracies utilize a direct democracy system that eliminates the need for selecting representatives.
B) Other democracies utilize a winner-take-all system in which the candidate with a plurality of votes wins the election.
C) Other democracies use a proportional system that awards seats based on the percentage of the vote that party received.
D) Other democracies select their representation the same way the United States does, so the process is not different.