I’m pretty sure the answer is balding hair.
I might be wrong, but I think the error is the way they spelled okay. When you are writing in an essay or any other forms of writing, I think you’re supposed to spell the word out instead of abbreviating it.
I hope this helps :)
A good reference for this is "The Five I's of Romanticism"
Imagination
Intuition
Individuality
Idealism
&
Inspiration