Usually, kids at this age are easily influenced by anything they see, either in their life, or on TV. So they will often try to imitate what happens on TV, whether consciously or unconsciously, that is not that important. Also, many studies have dealt with this question, and whether or not violence on TV actually causes violence of people in real life, but the results were always inconclusive.
Let's review. Realpolitik is a German word referring to politics-driven practical, or pragmatic, concerns rather than ideological ones
1. It enabled the Chinese people to navigate the seas and participate in sea trade.
2. It inspired China to expand its army and conquer more territory.
Your answer is D. The German Army went through Belgium and made America get involved