What Is the Effect of Burning Trees on Atmospheric Levels

What is the effect of burning trees on atmospheric levels of carbon dioxide?

A) Carbon dioxide levels increase because trees would ordinarily absorb carbon dioxide.
B) Carbon dioxide levels decrease because trees ordinarily produce carbon dioxide.
C) Carbon dioxide levels are unaffected because plants are not involved in carbon dioxide fixation.
D) Carbon dioxide levels increase because the rate of photosynthesis increases.
E) Carbon dioxide levels are unaffected because forests do not make a significant contribution to global carbon dioxide fixation.