Which of these statements is not true about plant sclerenchyma cells?

A) They can be gritty stone cells in pears and hard cells in nutshells.
B) Like parenchyma and collenchyma, they all contain cytoplasm at maturity.
C) Long fibers are used in products such as hemp rope, linen, ramie, and paper.
D) They are the main support and water- transport cells in woody plants.
E) Their cell walls contain lignin in addition to cellulose.