The listener falsely attributes a letter to Khalid rather than Amr. Which response addresses the disputed attribution most explicitly?

Supplementary Practice 7: Editing Expressions, Weighing Context and Rhetorical Critique

• إِنَّ الْكِتَابَ قَدْ وَصَلَ
• كَانَ الْكِتَابُ طَوِيلًا
• قَدْ كُتِبَ الْكِتَابُ
• مَا كَتَبَ الْكِتَابَ إِلَّا عَمْرٌو