Answer: D. The teacher should realize that Wind-Wolf is smart even though his culture is different.
The excerpt presented here attempts to show that cultural differences should not be assumed to be a sign of different mental abilities. Although the teacher might not realize it, Wind-Wolf has already been exposed to the concept of numbers and counting by being immersed in his culture. Although this knowledge might not be obvious in a classroom setting, it is a sign of Wind-Wolf's ability and willingness to learn.