Critical Reasoning (CR) | Educator: Reducing class sizes in our school district would require

Educator: Reducing class sizes in our school district would require hiring more teachers. However, there is already a shortage of qualified teachers in the region. Although students receive more individualized instruction when classes are smaller, education suffers when teachers are under qualified. Therefore, reducing class sizes in our districtwould probably not improve overall student achievement

Which one of the following is an assumption required by the educator’s argument?

(D) Hiring