Structure of transport tissues — practice question

Which row correctly recognises xylem vessel elements and sieve tube elements?

• Axylem vessel element: cytoplasm ✓, nucleus ✓; sieve tube element: cytoplasm ✗, nucleus ✗
• Bxylem vessel element: cytoplasm ✗, nucleus ✓; sieve tube element: cytoplasm ✗, nucleus ✗
• Cxylem vessel element: cytoplasm ✗, nucleus ✗; sieve tube element: cytoplasm ✓, nucleus ✓
• Dxylem vessel element: cytoplasm ✗, nucleus ✗; sieve tube element: cytoplasm ✓, nucleus ✗