iCloud backups on an iPad require sufficient storage space in the user’s iCloud account (5GB free by default, expandable via subscription). If the backup fails, the most common reason is insufficient space, as iCloud won’t proceed if the data exceeds available storage. Check this inSettings > [user name] > iCloud > Manage Storage.
Option A is irrelevant; Managed Apple Accounts support iCloud backups unless restricted by MDM, but the question doesn’t specify this.
Option B (Bluetooth) isn’t required for iCloud backups, which use Wi-Fi.
Option C is correct and a standard troubleshooting step.
Option D (passcode/unlocked) isn’t a requirement; backups occur when locked, on Wi-Fi, and charging.See Apple’s "If you can’t back up to iCloud" (support.apple.com/HT203516).
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