When rigging a bosun's chair, a tail block or lizard is used to __________.

Correct Answer: Option B — reeve the gantline through

A tail block is a block with a short length of rope (a tail) attached, used to provide a fairlead for the gantline. It is essential for directing the line correctly to the bosun's chair, ensuring the load is distributed properly and the line does not chafe against the mast.