You valuated an inspection characteristic based on a control chart.

Control charts in SAP QM (e.g., during results recording, transaction QGC1) monitor characteristic values against statistical limits. Rejection is based on:

Action Limit (D): The action limit (upper/lower control limit, UCL/LCL) is the threshold beyond which a characteristic is rejected, indicating a process is out of control. In Customizing (SPRO > Quality Management > Quality Inspection > SPC > Define Control Charts), exceeding this limit triggers rejection or further action (e.g., defect recording).

Warning Limit (A): Warning limits (e.g., 2-sigma) signal potential issues but don’t automatically reject the characteristic; they prompt monitoring, not rejection.

Moving Average Line (B): This tracks trends but isn’t a rejection threshold.

Center Line (C): The center line (mean) is a reference, not a limit for rejection.

Thus, "Action limit" is the correct answer, aligning with SPC rejection rules.References: SAP Help Portal - "Statistical Process Control in QM"; SAP S/4HANA QM User Guide - "Control Charts".