What function allows users to apply instructions for common actions to multiple posts simultaneously?

The correct choice is Macros. Macros are specifically designed to improve efficiency by allowing users to apply predefined actions to multiple posts at once. This feature streamlines repetitive tasks, enabling users to manage interactions more effectively without the need to manually process each individual post. By utilizing macros, users can ensure consistent application of responses or actions across similar posts, which saves time and enhances productivity.

The other options, while useful in their own contexts, do not specifically address the simultaneous application of instructions to multiple posts. Batch Actions typically refer to processing multiple items in bulk but may not necessarily allow for the tailored and defined actions that macros provide. Action Templates could suggest a structured approach to managing posts, but they don't offer the same level of automation or efficiency as macros. Workflow Automation is broader in scope and deals with automating processes within marketing workflows, rather than focusing solely on post management.