Context: Why do horses grind their teeth ? I feel as though it should be an indicator of pain or stress , yet he does n't seem to be in any pain and I ca n't figure out what might be stressing him . How can I get him to stop ? The noise is like nails on a chalkboard ... it gives me goosebumps !

Question: What may the narrator do with the horse ?
Options:
0. They may extract their teeth .
1. They may allow it to keep grinding its teeth .
2. They may take them to the vet .
3. They may leave them alone .
Answer: 2