The terracotta is made out of clay so it might feel like hard clay.
I believe A and C are the correct answers
The last one is false I believe. Very shortly after the site was uncovered, archaeologists came to excavate it, and the year after it was discovered they started building a museum on the site. Safe to say robbers probably would've had a hard time pillaging it when the whole archaeological community had their attention fixated on it.
Answer:
The reasons why the USSR stole the secret of how to create nuclear warheads can be found in the Cold War.
America, the main adversary of the Soviets during the Cold War period, was a country that had demonstrated its nuclear capabilities to the world in 1945, with the bombings of Hiroshima and Nagasaki. Therefore, it possessed the necessary technology to end an armed conflicts almost immediately and, consequently, its political power was enormous against countries without nuclear capacity.
The Soviet Union, then, had to equate its military forces if it wanted to politically equate itself with the United States. That is, if it managed to have the same threatening power as the United States, it would have similar political power.