You Plant a Seed in a Pot Containing Soil,and Then

Multiple Choice

You plant a seed in a pot containing soil,and then add water and place the pot under a light.After the seedling emerged,complete with two green leaves,the carbon dioxide levels decreased in the closed chamber.The developing seedling was using which of the following as a source of energy while the carbon dioxide levels were decreasing?

A) water from the soil
B) starch from the seed
C) sugars from the soil
D) nutrients from the soil
E) light