They both helped keep the balance between free and slave states .
1b.) To ensure that the religious beliefs and traditions would survive. The Vedas served as a powerful tool for the leaders, or rulers, of the people.
2a.) The social structure of Aryan society was based on the caste system.
2b.) The fourth caste was added to include native people. The caste became determined by birth. A class of workers below the Sundars evolved and were called the untouchables, who the dirty work and had no contract with the higher classes.
I believe the answer is b it’s the most significant movement that stressed human reasoning and it fits best in the time period. Hope this helps!
It's "C) Surfaces with higher pH levels protect lichens from acid rain."
