Your Best Friend Works in the Finance Office of the Delta

Your best friend works in the finance office of the Delta Corporation.You are aware that this friend trades Delta shares based on information he overhears in the office.You know that this information is not known to the general public.Your friend continually brags to you about the profits he earns trading Delta shares.Based on this information,you would tend to argue that the financial markets are at best _____ form efficient.

A) weak
B) semiweak
C) semistrong
D) strong
E) perfect