In the context of the term "plurality," it refers to having more votes than any other single candidate or option, but not necessarily a majority, which is more than half.
Based on that definition, the following examples represent a plurality:
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1,550 of the Democrat Party’s 4,765 delegates prefer a candidate. (This indicates that this candidate has more delegates than any other, but does not reach a majority.)
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205 of 538 members of the Electoral College vote for a president. (This suggests that this candidate received more votes than any other candidate, but does not state whether it is a majority.)
The other options either represent a majority or unanimous support, which do not qualify as pluralities.