To deliver a letter to Japan telling them to sign a treaty.
I think c would be the correct answer
Gupta Empire:
Expanded trade with Europe, China.
Made great cultural advancements.
Used the modern numbering system.
Invented standardized weight system.
Mauryan Empire:
United India for the first time.
Ruled by Ashoka.
Used army to conquer large territory.
Lasted only about 100 years.
Hope that helps.