Brian, the Owner of "Brian's Cheese House" Learned That His

Brian, the owner of "Brian's Cheese House" learned that his competitor, Bryan of "Bryan's House of Cheese,"
Just filed an application to register a logo that looks remarkably similar to Brian's logo. In response, Brian can ________.

A) do nothing
B) submit to the PTO an opposition to the proposed registration of Bryan's mark
C) file suit in the U.S. District Court for the District of Columbia
D) file a complaint with the Federal Trade Commission