Explanation:
The correct answer is C: Carbon dioxide and alcohol.

In anaerobic respiration, glucose is broken down to produce carbon dioxide and alcohol (usually ethanol in yeast or certain other organisms). This process occurs when oxygen is not available, and it produces less energy compared to aerobic respiration.

Here's why the other options are incorrect:
- A. Carbon dioxide and water: This is a product of aerobic respiration, where glucose is completely oxidized with oxygen.
- B. Carbon dioxide only: In anaerobic respiration, alcohol (or other byproducts like lactic acid in animals) is also produced, not just carbon dioxide.
- D. Alcohol and water: While alcohol is produced in anaerobic respiration, water is not a typical byproduct in this process.
- E. Water and acetic acid: This is not typical for anaerobic respiration in most organisms. Acetic acid is associated with other biochemical processes, but it's not a product of anaerobic respiration.

Therefore, in anaerobic respiration, the primary byproducts are carbon dioxide and alcohol.