Arizona Was the Site of a 400,000-Acre Wildfire in June

Arizona was the site of a 400,000-acre wildfire in June 2002. How much carbon dioxide was produced by this fire? Assume that the density of carbon on the acreage was 10 kg/m² and that 50% of the biomass burned. (10,000 m² = 2.47 acre)

A) 3 10¹⁰ kg
B) 3 10⁶ kg
C) 3 10³⁰ kg
D) 3 10⁹ kg
E) 3 10¹³ kg