Final answer:
The sentence contains an unclear pronoun reference, where the pronoun 'they' does not have a clear antecedent.
Step-by-step explanation:
The sentence contains an unclear pronoun reference.
An unclear reference occurs when the pronoun or noun used in a sentence does not have a clear antecedent or referent, making it difficult for the reader to understand what it is referring to.
In the sentence, the pronoun 'they' is used without a clear antecedent. It is unclear who or what 'they' refers to - whether it is the school district or another group of people.