Answer:
The correct option is a. chemical energy is released when glucose is broken down into carbon dioxide.
Step-by-step explanation:
Cellular respiration can be described as a process in which glucose and oxygen are converted into carbon dioxide and water. Energy is released in this process in the form of ATP. Hence, option A best describes this process.
Other options like Option C)' carbon dioxide and water are combined to make glucose and oxygen' are false because this option illustrates the process of photosynthesis which is the opposite of the process of cellular respiration.