Final answer:
A fact is considered insider information if it is not known to the public and can strongly affect the corporation's welfare.
Step-by-step explanation:
Under the Insider Information and Securities Fraud Enforcement Act of 1988, a particular fact would be considered insider information if it meets two specific criteria. The criteria are: B) It is not known to the general public, and C) It could have a strong effect on the welfare of the corporation. Criterion B ensures that the information is exclusive to insiders, and Criterion C confirms that the information is material, meaning it could influence an investor's decision to buy, sell, or hold securities if it were made public.