What triggers the duty to supplement or correct?

• A. If witnesses refuse to testify
• B. If a document is lost
• C. If the mandatory disclosures or responses to discovery are incomplete or incorrect
• D. If the other side requests

Answer: (C)

The triggering situation is when you learn that your mandatory disclosures or responses to discovery are incomplete or incorrect. There’s an ongoing duty to update and correct those disclosures as new information becomes known or circumstances change, ensuring the discovery record stays accurate for both sides. This is why the best choice is focusing on incomplete or incorrect disclosures or responses. The other scenarios—witnesses refusing to testify, a lost document, or the other side’s request—do not by themselves trigger the supplementation obligation.