B. Government power is split between a President and Congress
Benito Mussolini organized a military group and was granted the role of prime minister by the king
The primary election, often also called "the primary" is an election in the US in which the two main parties vote for their representative candidate for the President. The president isn't yet being chosen, instead the best candidate for the president is chosen - the one that has the best chances to win.
Therefore the best answer is C.
I personally agree with Truman's refusal to use nuclear weapons against China in the Korean War. From a humanitarian point of view, it was going to be an even bigger catastrophe than what happened in Japan, as China had much more people, so a nuclear intervention would have meant death to millions of people, mostly innocent ones. From tactical point of view, it was also a bad move, because the Chinese would have probably not given up and would have seek revenge. Also, they were backed and allied by the Soviet Union. A nuclear usage would have meant an open war with the Soviets, and that was the last thing that the United States wanted, as they didn't had any significant advantage against the Soviets.