How does the burning of fossil fuels increase the greenhouse effect?

by decreasing the absorption capacity of greenhouse gases
by decreasing incoming solar radiation
by releasing carbon dioxide into the atmosphere

The answer would be "by releasing carbon dioxide into the atmosphere."

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

Either b or c . i did this before