The theme is mostly always in the first sentence or last sentence, for this one, it is the first sentence, “long-term governments should not be changed lightly.” So the answer would be C.
You posted this question three times.
An adjective clause is a dependent clause that, like adjective which modifies a noun or pronoun. Adjective clauses begin with words such as that, when ,where, who, whom, which, and why...... hope that helps!!!
The recurrence of words and phrases for a specific effect
Answer:
Education for Greek people was vastly "democratized" in the 5th century B.C., influenced by the Sophists, Plato, and Isocrates