In U.S., the majority party of Democratic and Republican dominates the country's politics.
The Democratic and Republican party are called the majority party because they both have enough electoral strength to gain control of the government.
These political party have the highest share of follower and this forms their power because the parties with largest follower emerge as winner for an official position.
For instance, since 2010 - date, the US politics is dominated by the the Democratic and Republican party.
In conclusion, the Option B is correct.
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