I believe B. the material is cooler and denser would be correct.
The colder something is, the more density it has. Earth's core is too hot to be very dense, so that's why I would go with B.
It's the "alleged" genocide of the Armenian people, which Turkey categorically denies to this day.
Perestroika called for the restructuring of many aspects of the Soviet Union, for example for the restructuring of the economy. It called, among others, for more openness in communication between the government and the people.
Answer:
I think that the answer is G
Answer: D. Shipping technologies advanced immediately