An Early Experiment by Van Helmont (1600s)describes How He Grew

An early experiment by Van Helmont (1600s) describes how he grew a tree in a large pot and found that after five years,the amount of soil in the pot had not changed.He concluded that the increase in weight was due to the addition of water.At that time,the compounds of the air had not yet been identified.Today,it is known that he only discovered half the story.Which of these experiments would NOT provide evidence that materials from a source other than water were involved in photosynthesis?

A) Carbon is discovered as a major element in trees and is lacking in water molecules.
B) Radioactive carbon in carbon dioxide in the air is identified as part of tree structures.
C) A very careful analysis of the water taken in and lost by the tree would have revealed only part of the added weight gained by the tree.
D) After adding radioactive water with labeled oxygen to a plant, radioactive oxygen is given off.
E) Radioactive carbon is found in stored glucose molecules after supplying a plant with radioactive carbon dioxide.