In Considering the Criteria for an Ideal Voting System, an Irrelevant

In considering the criteria for an ideal voting system, an irrelevant alternative refers to:

A) when an option that is unrelated to the issue being voted on is added to a vote.
B) a different voting method that could alternatively be used, but would not change the outcome.
C) when an option that has no realistic chance of winning is added to a vote.
D) a different voting method that could alternatively be used and could change the outcome.