Final answer:
Desdemona tries to shift Othello's attention from the handkerchief to their upcoming travels, which only worsens Othello's suspicions.
Step-by-step explanation:
Desdemona attempts to change the subject from that of the handkerchief by b. She tries to divert Othello's attention by discussing their upcoming travels. This diversion is a strategic move on her part to deflect Othello's growing suspicion and jealousy about the missing handkerchief. However, in doing so, she inadvertently stokes Othello's anger as he perceives her insistence on discussing Cassio as further evidence of her (falsely) presumed infidelity.