Answer:
Option A Riley and Tess only.
Step-by-step explanation:
The reason is that the engineer and his friend Tess both are involved in the insider dealing which gives undue advantage due to the access to the information. This undue advantage is all because the seller doesn't knows about the inventions and innovation of the product. So the person who are involved in the insider trading according to the securities exchange act 1934 are liable for the losses to the seller.