Foresters Girdle Trees in a Forest to Decrease Tree Density

Foresters girdle trees in a forest to decrease tree density.Girdling removes the ring of outer and inner bark,including the phloem,around the trunk of the tree and below the branches.Why do girdled trees die?

A) Carbon dioxide intake required for the production of sugar is prevented.
B) Chlorophyll is not spread among the leaves sufficiently for food production.
C) Minerals required for cell function can no longer be distributed to the leaves.
D) Water can no longer be transported from the roots to all the parts of the plant.
E) Sugars can no longer be moved throughout the plant to the cells that need them.