Girdling Is a Procedure to Kill Unwanted Tress by Cutting

Multiple Choice

Girdling is a procedure to kill unwanted tress by cutting a groove into the bark of the tree.The groove must completely encircle the trunk and should penetrate into the wood to a depth of at least 1/2 inch on small trees,and 1 to 1-1/2 inches on larger trees.Why does this procedure cause tree death?

A) No water can be transported from the roots to the leaves.
B) No water can be transported from the leaves to the roots.
C) No sugars can be transported from the leaves to the roots.
D) Both water and sugars are prevented from being transported.