Final answer:
b) Cellular respiration, Cellular respiration is the process that best describes the energy available to do cellular work.
Step-by-step explanation:
The energy available to do cellular work is best described by cellular respiration. Cellular respiration is a metabolic process in which cells convert glucose into ATP (adenosine triphosphate), the molecule that provides energy for cellular activities. During cellular respiration, glucose and oxygen are broken down to produce carbon dioxide, water, and ATP. This process is essential for organisms to carry out various cellular processes, such as growth, reproduction, and movement.