If the Combustion of Fossil Fuels Adds About 5 *10¹²

Multiple Choice

If the combustion of fossil fuels adds about 5 *10¹² kg of carbon to the atmosphere as CO₂ each year, how much oxygen is required to produce this amount of carbon dioxide?

A) about 1.3 *10¹² kg
B) about 1.3*10¹³ kg
C) about 2.6 *10¹² kg
D) about 2.6*10¹³ kg
E) about 6.7 * 10¹² kg