How do fossil fuels play a role in the carbon cycle

Question

a Fossils fuels require a lot of carbon to burn which takes carbon out of the atmosphere
b Fossils fuels are rich in carbon and burning them returns carbon to the soil
c Fossils fuels require a lot of carbon to burn which releases carbon in the atmosphere
d Fossils fuels are rich in carbon and burning them releases carbon in the atmosphere

Answer 1

d Fossil fuels are rich in carbon and burning them releases carbon in the atmosphere.