Specialised cells, tissues and organs — practice question

The diagram illustrates three different kinds of microscopic structure. What are these structures?

• A1 xylem vessel; 2 root hair cell; 3 red blood cell
• B1 red blood cell; 2 xylem vessel; 3 root hair cell
• C1 root hair cell; 2 red blood cell; 3 xylem vessel
• D1 xylem vessel; 2 red blood cell; 3 root hair cell