The answer is definitely D, because it contains two independent clauses that are joined together without a comma or conjunction. (An independent clause just means a chunk of language that has both a subject and a verb and could be a complete sentence on its own.)
Hair is how most people express themselves and it wrong for people to tell them to change it just because they don’t like it.
It could tell them data of how many days the student was absent or how many days the student was present.
