In Which of the Following Situations Is It Least Likely

In which of the following situations is it least likely that property of the original trust could be traced by the beneficiaries? (Think carefully before answering) .

A) Reginald, as trustee, withdrew £60,000 from a trust and put it into his own bank account, which contained £10,000. Reginald spent £10,000 on a world cruise.
B) Katrina withdrew £2,000 in breach of trust, and put it in her bank account, containing £1,000. Katrina spent £3,000 on a luxury weekend in Paris. She has since deposited a further £2,000 into the account.
C) Harold, as trustee, withdrew £4,000 from a trust and put it into his own bank account, which contained £6,000. Harold bought a second-hand Harley Davison motorcycle for £4,000 and then spent the remainder of the bank account on a coast-to-coast biking holiday in the United States of America.
D) Melissa took £5,000 in breach of trust from the trust, and placed it into the current account of another trust for which she was a trustee. The current account contained £5,000. Melissa then took £5,000 from the current account and used it to pay her medical bills.