i think its the first one (I'm not sure tho but i will leave the explianation)
Explanation:
Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached to other atoms of such elements as hydrogen, oxygen, and nitrogen.
It is (D) Carbon dioxide. in lactic acid=C6H12O6 to produce 2C3H6O3+Energy. in alcoholic fermentation=C6H12O6 to produce 2C2H5OH+2CO2. therefore all of them produce (D) Carbon dioxide.
