Which is the author most likely foreshadowing in this passage by focusing on the missing boot?
1. Dr. Mortimer will confess that he took the boot in order to replace one of his.
2. Although appearing to be trivial, the missing boot will turn out to be significant.
3. Sir Henry will begin to lose each of his shirts and jackets during his stay in Britain.
4. Sherlock Holmes will realize that asking questions does not help to solve mysteries.