Rita fixed a candle at the bottom of a trough containing water. After lighting the candle, she inverted a gas jar over it. What did she observe?

• A.  The flame continued to burn and water rose in the jar.
• B.      The flame was put off and water rose in the jar.
• C.      The flame continued to burn and water became milky.
• D.      The flame was put off and black smoke was deposited on the sides of the jar.