You want to create a quality notification for the Customer Complaint notification origin.

For a customer complaint notification (type Q1, transaction QM01), standard reference documents include:

Delivery (A): Outbound delivery documents (e.g., from VL01N) are commonly referenced, linking the complaint to a shipped item (SPRO > QM > Quality Notifications > Notification Creation).

Sales Order (D): Sales orders (e.g., from VA01) can be referenced to trace the complaint back to the original customer order.

Quotation (B): Quotations are pre-sales documents and not standard references for QM notifications.

Material Document (C): Material documents (e.g., GR) are procurement-related, not typical for customer complaints.

Thus, "Delivery" and "Sales order" are the correct answers.References: SAP Help Portal - "Reference Documents in QM Notifications"; SAP S/4HANA QM User Guide - "Customer Complaints".