Final answer:
Some anaerobic protists obtain energy using hydrogenosomes, as they function similarly to mitochondria but are adapted for anaerobic conditions, making them the correct answer. The correct option is c.
Step-by-step explanation:
Some anaerobic protists obtain energy using hydrogenosomes. Hydrogenosomes are organelles that produce ATP without the use of oxygen, functioning in a way that is akin to mitochondria but suited for anaerobic conditions. They are found in some anaerobic eukaryotic microbes, such as certain parasitic or symbiotic protists.
While mitochondria and cytochromes are associated with aerobic respiration processes, they are not typically utilized by anaerobic organisms. Therefore, among the choices given, hydrogenosomes are the correct answer for anaerobic protists. Protists can exhibit many forms of nutrition; some are aerobic and use mitochondria, but those living in an anaerobic environment rely on structures like hydrogenosomes to meet their energetic needs.
Therefore, the correct option is c.