The diagram illustrates how phloem sieve tube elements, xylem vessel elements and companion cells are related. Which row is correct?
- A1 companion cells; 2 endoplasmic reticulum; 3 phloem sieve tube elements; 4 no nucleus; 5 xylem vessel elements
- B1 companion cells; 2 nucleus; 3 phloem sieve tube elements; 4 cytoplasm; 5 xylem vessel elements
- C1 phloem sieve tube elements; 2 mitochondria; 3 companion cells; 4 nucleus; 5 xylem vessel elements
- D1 xylem vessel elements; 2 no cytoplasm; 3 phloem sieve tube elements; 4 vacuole; 5 companion cells