Final answer:
Local fire codes must be consulted when framing an opening around a chimney to establish proper clearance.
Step-by-step explanation:
When framing an opening around a chimney, local fire codes must be consulted to establish proper clearance. These codes specify the minimum distance that should be maintained between the chimney and combustible materials, such as wood framing. This is crucial to ensure fire safety in the building.
Framing an opening that does not adhere to the required clearance can pose a significant fire hazard. By following local fire codes, builders can ensure that the chimney has adequate space around it to prevent the risk of fire.
Therefore, the correct answer is a. proper clearance.