Answer: C. license teachers
Step-by-step explanation:
State governments wield significant control when it comes to education in their states as they can establish the curriculum, license private schooling in the state, provide public schooling all the way to tertiary level and license teachers.
These teachers are to be licensed based on their understanding of the educational policies of the state so that the state's educational policies are better enforced. Also under the state government are parents who decide to homeschool their kids, they would need to be licensed by the state government.