Concept:"Dishevelled" refers to a messy or disorderly appearance, especially of hair, clothes, or overall look.
Explanation:In the sentence, Audu arrived at school looking dishevelled.
This means his appearance was not neat or well arranged.
The word "untidy" is nearest in meaning to "dishevelled."
"Worried" relates to mental anxiety, "terrified" to extreme fear, and "confused" to mental uncertainty.
None of these describe a person's physical appearance.
Therefore, the correct choice is option C.
Answer:C. untidy