If a person wants to sort a pile of stuff, they must start by what?
Options:
- control computer
- go on vacation
- cross street
- gain weight
- separate things
Let's think carefully first. Step-by-step reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Sorting means arranging things in an orderly fashion. One must separate things first to sort them. So the final answer is separate things.