When can it be appropriate to enter your seed phrase?
Correct answer
Answer B: When restoring your own wallet in a trusted environment.
Quick explanation
The seed phrase is used to restore your wallet. Only enter it when you initiate that recovery yourself using a trusted application or device.
Detailed explanation
The seed phrase backs up the data from which a compatible wallet can restore its keys. Entering it can therefore make sense when you deliberately start recovery yourself on a trusted device or application.
That process must be distinguished from someone else's request. Support staff do not need the words to investigate a problem. Nor must they be shared simply to receive a payment or unlock a displayed balance.
The reason for recovery and the trustworthiness of the recovery method are decisive. An unexpected message, link or professional logo does not establish that trustworthiness. Someone obtaining the required recovery data may be able to control the associated bitcoin themselves.
Example or everyday application
Your device breaks. You independently start the intended recovery process on a verified replacement device. This differs from a message asking you to enter your words on someone else's website.
Common misconception
The correct rule is not that seed words must technically never be entered. In particular, they must not be disclosed at supposed support staff's request or in an unverified form.
What the sources support
Bitcoin sources explain the seed phrase as a recovery secret. The FTC documents common cryptocurrency scams. The practical bridge is that a seed phrase is needed only for a recovery you initiate in a trusted wallet, not for support or “verification”.