You Come Across a Recipe for Rhubarb Pie

You come across a recipe for rhubarb pie.Never having heard of rhubarb,you do a little research.You find out that the part of a rhubarb plant that people eat is the petiole of a large leaf.You purchase some rhubarb for your pie and notice that it contains many long stringy fibers.Based on your knowledge of plant tissues,you know that the stringy fibers are

A) parenchyma tissue.
B) phloem tissue.
C) sclerenchyma tissue.
D) collenchyma tissue.
E) xylem tissue.