Please help solve the problem that I have come across. <br/><br/>________left this behind will certainly come looking for it soon.<br/><br/>(A) Whoever<br/><br/>(B) Whomever<br/><br/>(C) Whosever<br/><br/>(D) Who<br/><br/>The answer on my book says (B) is correct but I think it might be wrong. Please tell me if this is the correct answer.