One, two and four are limitations of psychological experiments.
A. the existence of other galaxies
Answer:
Hinduism reinforced a strict social hierarchy called a caste system that made it nearly impossible for people to move outside of their social station.
Explanation:
Hinduism reinforced a strict social hierarchy called a caste system that made it nearly impossible for people to move outside of their social station. Emperors during the Gupta empire used Hinduism as a unifying religion and focused on Hinduism as a means for personal salvation.
Maritime transportation became less important to developed countries
in the 1950s, planes became a more popular mode of transportation, so traveling by sea was not as popular to developed countries
