To change "Nobody trusts a traitor" into passive voice, the object "a traitor" becomes the subject. Since "Nobody" is negative, it changes to "is not... by anybody."

১. The verb "trusts" is in simple present, so the passive needs "is/am/are + V3."
২. Option A is the opposite in meaning, and Option B changes the mood by adding "should."
৩. Therefore, "A traitor is not trusted by anybody" is the most accurate transformation.

অতিরিক্ত তথ্য: Negative subjects like "None" or "Nobody" often require "not... anybody" in passive voice.