All the following activities belong to primary industries except

Primary industries are those that are directly involved in the extraction and collection of natural resources from the environment. They include activities like farming, fishing, forestry, and mining. Out of the options given, processing is the only activity that does not belong to primary industries. Processing involves converting raw materials obtained from primary industries into finished or semi-finished products that can be sold to consumers. Therefore, processing is a secondary industry. So, the correct answer is: processing.