The correct answer is the second option. Anaerobic respiration is a type of respiration which involves the use of electron acceptors other than oxygen. This is respiration without using oxygen. An example is alcohol fermentation where the the reactants are glucose and enzymes forming to products which are CO2, ethanol and energy.
The activated complex is the intermediate that is formed between the states of reactants "F" and products "G".
Letter A represents the activation energy of the reaction, that is the difference in potential energy between the reactants "F" and activated complex "B".
Letter C represents the enthalpy change of the reaction, that is the difference in potential energy between products "G" and reactants "F".
Letter D represents the potential energy of products "G".
Letter E represents the potential energy of reactants "E".
