Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?

When listening to a single-sideband (SSB) signal, the pitch of the received voice depends directly on the receiver's tuning. If a station replies to your CQ and their voice sounds unusually high or low, your receive frequency is slightly mismatched from their transmit frequency. To fix this without altering your own transmit frequency (which would cause you and the other station to endlessly chase each other across the band), you use the Receiver Incremental Tuning (RIT) or Clarifier control. This knob allows you to adjust only your receive frequency slightly so the incoming voice sounds natural. Other controls like AGC (Automatic Gain Control), tone squelch, or bandwidth selection do not adjust the frequency tuning, so they cannot fix an SSB pitch issue.