Questions: How many pairs of cranial nerves are there? 24 8 12 31

The answer is the third one (12): There are 12 pairs of cranial nerves.

Explanation for each option:

1. 24: This is incorrect. There are not 24 pairs of cranial nerves.
2. 8: This is incorrect. There are more than 8 pairs of cranial nerves.
3. 12: This is correct. There are 12 pairs of cranial nerves in the human body, each with specific functions related to sensation and motor control.
4. 31: This is incorrect. There are 31 pairs of spinal nerves, not cranial nerves.

In summary, the correct answer is that there are 12 pairs of cranial nerves.