Harrison hires an agent to look for a three$-$bedroom house in Atlanta, Georgia. Elaine, the agent, finds a three$-$bedroom house within Harrison's budget but purchases it herself without informing Harrison. This is an instance of an agent doing which of the following?

A$.$ violating the duty of accounting

B$.$ engaging in a dual agency

C$.$ usurping an opportunity

D$.$ committing a white$-$collar crime