Which is the best definition for bias in history? the opinions and prejudice of an author in writing whenever a historical event is confusing each time a historical event is omitted from text reporting an event without any opinions

The opinions and prejudice of an author in writing.

I believe that those two elements greatly affect bias in history because we can never be 100% sure of everything that (may have) happened in history (especially farther in the past), so opinion can affect a historian's writings. Also, everyone is prone to some sort of prejudice, so this can also affect history.