What happens if a gymnast fails to present before and after the routine?

When a gymnast fails to present before and after their routine as required, a deduction is applied to their score. Presenting is an essential part of the routine as it signifies the start and finish of the performance, allowing the judges to clearly mark the beginning and end. This presentation includes acknowledgement to the judges and audience, which is part of the overall performance evaluation. Not adhering to this requirement disrupts the flow and structure of the event, prompting judges to enforce a deduction as a penalty for non-compliance.

The other options reflect different possible responses to errors in routines, but in the specific case of failing to present, the standardized protocol is to apply a deduction to emphasize the importance of this aspect of a gymnast's performance.