Answer:
a. Insider traiding
Step-by-step explanation:
The US Securities and Exchange Comission (SEC) defines illegal insider trading as "Buying or selling a secturity, in breach of a fiduciary duty or other relationship of trust and cofidence, on the basis of material, nonpublic information about the security".
Sally knew this imformation was non-public meaning this information was not available to the public, still she told Alice. Also she is an executive of the Company, and she benefit from the stock purchase, before the compnay´s purchase.