Answer:
A militaristic country has a large defense force on which it spends a disproportionate share of its income.
Explanation:
They were the best Ship Builders and best Sailors of Mesopotamia. They made the first see through glass.
The Gupta empire was made up of
Brahims a.k.a the priests
Vaishyas a.k.a merchants and tradesman
Shudras a.k.a Peasants
Kshatriyas a.k.a warrior and rulers
The fourth choice satisfies this list.