Explanation:

- A threatens B with publishing defamatory material to obtain money.

- A uses coercion, demanding money by instilling fear.

- Extortion involves obtaining something through threat or force.

Options explanation:

- Theft: Involves taking someone's property without consent intending to permanently deprive them of it. No threats are involved in this scenario.

- Robbery: Involves theft with violence or threat of violence. The scenario doesn't involve an act of theft.

- Criminal Intimidation: This involves intentional intimidation threatening injury to another person. Money is typically not exchanged or demanded in this process.

- Extortion: Occurs when one demands money by placing someone in fear of harm or other adverse consequences.