In woody dicotyledons,the arrangement of vessels is either diffuse porous or ring porous. Based on these data,which one of the following statements is correct?

• A
  Ring porous vessels are specialised and are used for conducting more water for a shorter period only,when tyloses occur early in the vessels.
• B
  Although diffuse porous vessels are not so specialized as ring porous vessels,they conduct more water at all periods and through new xylem vessels added gradually during development.
• C
  Diffuse porous vessels carry more water and also faster because of a greater number of small vessels having greater capillary force.
• D
  Ring porous vessels conduct more water as they are formed early during development,when the need for water is great.