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C. Developed advanced medical treatments

Explanation:

Gupta Empire was founded in present-day India. It lasted between the period around 320-550 CE. The Gupta Empire was characterized by various successes and advancements, some of which includes the development of advanced medical treatments.

This is evident in the fact that during this period, medical practitioners in the empire were able to conduct and document the practice of wound sterilization and caesarian operations. Also was the drug inventions and vaccinations such as smallpox vaccines.

d. people are naturally good, and their expressed will is what is best for society

explanation:

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do