Which of the following two sources of carbon is released? A) Volcanic eruption B) Combustion of fossil fuels C) Landslide D) Open mining Choose the correct answer from the options given below:

Which of the following two sources of carbon is released? A) Volcanic eruption B) Combustion of fossil fuels C) Landslide D) Open mining Choose the correct answer from the options given below: Correct Answer A and B only

• Carbon dioxide (CO2): it has a greenhouse effect and described as "the leading pollutant" and "the worst climate pollutant". 
• Due to human activities, the atmospheric concentration of carbon dioxide has been rising extensively since the Industrial Revolution and has now reached dangerous levels not seen in the last 3 million years.
• The major sources of carbon dioxide can be categorized under two heads are as follows,

Therefore, A and B only correct options.