Who can sell or purchase liquids or gases intended for refrigeration use?

The ability to sell or purchase liquids or gases for refrigeration use is typically restricted to those who possess the necessary knowledge and credentials to handle these substances safely and in compliance with regulations. Option C clearly outlines that distributors, jobbers, manufacturers, and licensed contractors are the authorized parties for such transactions. This is crucial as these professionals are expected to be trained in the proper handling, storage, and application of refrigerants, which can be hazardous if mismanaged.

Distributors and jobbers provide essential logistics and accessibility for the refrigerants, while manufacturers produce them in accordance with safety standards. Licensed contractors are knowledgeable about refrigeration systems and can ensure the products are used correctly in installation and maintenance.

The other options do not adequately cover the necessary credentials or context; for example, suggesting that only manufacturers and distributors can sell or purchase these substances neglects a critical role played by licensed contractors. Similarly, stating that any contractor can engage in these transactions overlooks the specific licensing and certification that ensures safe handling practices. The option regarding the necessity of an EPA certification card is also limiting as it does not encompass all the parties involved in the purchase and sale of refrigerants, including those who might not hold an EPA card but are still qualified through other certifications or licensing mechanisms.