Final answer:
To notarize an affidavit for your neighbor, ask for proper identification and witness the signing of the document.
Step-by-step explanation:
When asked to notarize an affidavit for your neighbor, the correct response is to ask for proper identification and witness the signing of the affidavit. This is to ensure that the person signing is indeed your neighbor and that the document is being executed correctly. Refusing to notarize the affidavit without a valid reason or notarizing it without any hesitation would not be appropriate.