In the given picture there is a lime water in A and B test tubes. A boy is breathing out the air into the test tubes. Predict your answers for the following : What was the colour of lime water in test tubes 'A' and 'B' before you began the experiment ?

Options

A. The lime water will turn milky indicating the presence of carbon dioxide in exhaled air.
B. The lime water will turn milky indicating the presence of oxygen in exhaled air.
C. The lime water will remain unchanged indicating the presence of carbon dioxide in exhaled air.
D. The lime water will remain unchanged indicating the presence of oxygen in exhaled air.