Final answer:
All options listed except for option c could be grounds for suspension or revocation.
Step-by-step explanation:
All of the options listed could potentially be grounds for suspension or revocation of a license, except for option c. Licensee is found guilty of improper information on the official sign. The other options, such as concealment (a), conversion (b), and being found guilty of another crime in another state (d) can all be valid grounds for suspension or revocation.