The correct answer is C.
A bias is a prejudice against a person, group of people, a fact or an idea which tends to be considered unfair.
" The world will little note, nor long remember, what we say here..." - this sentence is carrying a biased vision of the reception of these words. It implies that the world will not care about the words spoken here, nor will they be remembered for long. The bias here is a mere assumption and not a real fact, it puts a negative impact on the statement and it jumps too quickly to a unfair conclusion.