Hello,

The correct answer is c) common salt.

• Sublimation is the process where a solid turns directly into a gas without becoming a liquid first.
• Camphor and naphthalene are classic examples of substances that sublime at room temperature or with gentle heating.
• Common salt (sodium chloride) does not sublime. When heated to very high temperatures, it follows the normal process of melting into a liquid and then boiling into a gas.

Hope it's helpful to you.