Context: Files out of the crate , take each file one at a time , identify the treasures , purge the rest , return the file to the crates ( making new folder and using new hanging folder as needed ) , repeat . In 2 hours , I 'd purged about 85 % of that file crate . It 's not immediately obvious , since I had shoved about 30 file folders into two hanging files , and adding 24 hanging files added 3 " to the overall size . So it looks as if I went from 14 " to about 5 " .

Question: Why might I have been able to purge so much of the files ?
Options:
0. The files must have been getting purged as they gathered .
1. The files must have been gathering while being purged all the time .
2. The files must have been gathering without being purged for a short time .
3. The files must have been gathering without being purged for a while .
Answer: 3