What did the truman doctrine promise?
a. to liberate poland
b. to send aid to all nations threatened by soviet expansion
c. to drop an atomic bomb in the ussr if they did not leave poland
d. to resign the united states from the united nations if the soviet union remained a member

i would think it's industries and hydroelectric power

explanation:

these are the geographical features of the gupta empire.

1)it inherited the land owned by the mauryan empire.

2)one obvious difference between the two empires is that the gupta empire was smaller that the mauryan.

3)the gupta empire is located in the northern region of the subcontinent underneath the himalayan and hindu kush mountains.

the gupta empire, marked by extensive inventions and discoveries that contributed to hindu culture, in subjects such as science, technology, engineering, art, dialectic, literature, logic, mathematics, astronomy, religion, and philosophy.

this period was also known as the golden age of india