How does a third party candidate play the role of spoiler in an election? The third party candidate endorses (supports) one of the major party candidates, causing the opponent to win

The third party candidate takes votes away from one of the major party candidates causing their opponent to win

The third party candidate drops out of the race, eliminating their own chance of winning the election.

The third party candidate wins the election

b) The 3rd party canidate takes votes away from one of the major party candidates causing their opponent to win

Explanation:

Roosevelt and Taft were both running for president against Woodrow Wilson.  Roosevelt split from the Republican party to create the Bull Moose Party leaving Taft as the official Republican canidate.  Because of this the Republican vote was split between Roosevelt and Taft.  This lead to Woodrow Wilson's overwhelming victory.  

this is not a question this violates the rules. but good luck getting out chum