One Way to Kill a Tree Is to Girdle It

One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree.The tree will typically survive that growing season,but will die over the winter.Why wouldn't girdling work on a large grass?

A) The vascular bundles are in a ring just under the bark.
B) The vascular bundles are scattered throughout the ground tissue.
C) Monocots don't have vascular bundles.
D) Eudicots don't have vascular bundles.
E) Grasses have taproots.