D is the answer but A can also be the answer
The correct answer is D) Stalin was growing increasingly suspicious of the United States and Britain, and Truman and Attlee were growing increasingly suspicious of the USSR.
Just took the test and got it correct. I hope this was helpful!
I believe the answer is education.
The first astronomer to state the fundamental laws of planetary motion, Kelper was also known for his works in geometry, optics and philosophy.