High schools today would compare to Puritan grammar schools
Answer: Option C
Explanation:
Grammar School which is also known as Latin school and is equivalent to high schools of today. Children of upper classes used to pursue their higher education either by attending Latin grammar schools or secondary schools.
In these schools, they were taught Greek and Latin and the classics which helped them to prepare for the college education. One of the oldest Latin schools in U.S. is Boston Latin school founded in the year 1635 and is presently operating in the country.