According to the Apple Device Support Reference Materials, you can change the undo send delay setting on your iPad by going to Settings > Mail > Undo Send Delay1. This setting allows you to unsend an email within a certain time frame after you tap the send button. You can choose from Off, 10 seconds, 20 seconds, or 30 seconds. The other options, A, B, and C, are not correct because they are not the correct paths to access the undo send delay setting. General > Mail > Undo Send Delay is not a valid path in the iPad settings2. Open your mail app then open settings and select Undo Send Delay is not a valid option because the mail app does not have its own settings menu3. Settings > Mail > Accounts > Undo Send Delay is not a valid path because the Accounts section does not have an undo send delay option4. References: 1: Unsend email with Undo Send in Mail on iPad - Apple Support, Section "Delay sending emails". 2: General settings on iPad - Apple Support 3: Mail settings overview for iPad - Apple Support 4: Manage email accounts in Mail on iPad - Apple Support