Final answer:
Letters found in Roderigo's pockets in Shakespeare's 'Othello' provided evidence against Iago.
Step-by-step explanation:
The items found in Roderigo's pockets, which served as evidence against Iago, are B. Letters. In William Shakespeare's play Othello, it is the discovery of these letters that reveals Iago's manipulative plans and his involvement in the sinister plot against Othello and other characters. This event is pivotal to the narrative as it leads to the unravelling of Iago's schemes and contributes to the tragic conclusion of the drama.