In the Process of Organismic Respiration

In the process of organismic respiration:

A) oxygen is extracted from the environment by the organism and delivered to its cells.
B) the citric acid cycle takes place in the cells.
C) carbohydrates are broken down and electrons are transferred to oxygen.
D) there is an accumulation of lactic acid in the tissues due to the absence of oxygen.
E) carbon dioxide is produced in the Krebs cycle.