Jean Baptista Van Helmont Performed an Experiment in Which He

Jean Baptista van Helmont performed an experiment in which he planted a small willow tree in a pot of soil,after weighing both the plant and the soil.He watered the plant regularly.At the conclusion of the experiment five years later,the weight of the tree increased by 74.4 kg,while weight of the soil decreased by 57 kg.The primary source of the increased weight (mass) of the plant is from

A) oxygen in the air.
B) carbohydrates absorbed through the roots.
C) the water he added.
D) CO₂ in the air.