All the kooky kids enjoyed each other's company, to them their behavior was perfectly what?
Options:
- ordinary
- straight
- normal
- cool
- mainstream
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
Kooky means strange or eccentric. Normal means confirming to a standard, usual, typical or expected. All the kooky kids enjoyed each other's company, to them their behaviour was perfectly normal. So the final answer is normal.