What Prevents Majority Tyranny Over a Minority in Most Policy

What prevents majority tyranny over a minority in most policy decisions in a democracy?

A) The composition of the majority and minority is always shifting, depending on the issue.
B) Elected representatives must conform to voters' wishes.
C) Competitive elections require two sides to every issue.
D) Majoritarian concerns are not associated with democracies, so they can't create a tyranny.
E) When the minority enjoys a fixed status, there is no need to worry about the majority's power.