Orsat gas analyzer determines volumetric composition of the flue gases in respect of:

• A. \[{{O}_{2}}\] and \[{{N}_{2}}\]
• B. \[{{O}_{2}}\] and \[C{{O}_{2}}\]
• C. \[C{{O}_{2}}\] CO and \[{{N}_{2}}\]
• D. \[{{N}_{2}},\] \[{{O}_{2}},\] \[C{{O}_{2}}\] and CO