A Fifteen-Foot Tree Growing in a Fence Row Is Used

A fifteen-foot tree growing in a fence row is used as a fence post to which barbed wire is stapled at a height of five feet.Years later,the tree is thirty feet high.The barbed wire of the fence is embedded in the tree bark at

A) still five feet high since the lengthening of the trunk occurs at the apical meristem.
B) fifteen feet up since the tree doubled in height.
C) twenty feet up, still ten feet from the top of the tree.
D) twenty feet up, but because it added fifteen feet to the original five-foot height.
E) ten feet up, half of the increase in size; the second half is an increase in the girth of the tree