Explanation:

Statement 1 - No. User1 is included in JIT protection. File1.docx is on Device1, which is onboarded to Microsoft Defender. However, File1.docx has not been evaluated for file classification, meaning JIT cannot enforce protection on it. If User2 signs in to Device2 and attempts to attach File2.pdf to an email, JIT will block the action.
Statement 2 - No. User2 is not configured for JIT protection (JIT does not apply to them). File2.pdf has been evaluated for classification, but since User2 is not included in JIT protection, no blocking occurs. If User3 attempts to copy File3.xlsx to a network share, JIT will generate an audit event.
Statement 3 - No. User3 is included in JIT protection. However, Device3 is not onboarded to Microsoft Defender, meaning JIT protection cannot enforce actions on it. File3.xlsx has not been evaluated, so even if the device were onboarded, JIT would not have classification data to act upon.