Final answer:
Susan could be liable for insider trading due to selling her stock based on material nonpublic information obtained from the CEO of a drug company, an act prohibited under the Securities Exchange Act of 1934.
Step-by-step explanation:
In the scenario presented, Susan has used nonpublic information that she obtained through her personal relationship with Mike, the CEO, to sell her stock in a drug company before the information was made public, thus avoiding significant losses. This is a classic example of insider trading.
Although not a traditional insider, Susan's actions fall under the concept of "tipping" or "tippee" liability, where someone receives material nonpublic information from an insider and trades on that information. The correct statement regarding this case is that Susan could be liable under the Securities Exchange Act of 1934. This act holds that tipping and trading on confidential information is illegal, and those who do so can face civil and criminal penalties regardless of their status within the company, if they are found to have breached a duty of trust and confidence by sharing or using that information.