I may not be right but the answer to this is B
Answer:
The correct answer is option C the Security Council.
Explanation:
The main power of the United Nations is the Security Council which is formed by the five winners of World War II: UK, France, USSR, China and the United States and they all have the veto power.
The correct answer is that it increased their power
The standing armies were controlled by the kings and since the kings enjoyed the support of the people who started having nationalistic tendencies the support for standing armies grew as well. This was combined with the fact that nobles started losing influence and support which means that they wouldn't be able to have armies at their side and there would be a standing army of the entire nation.
A.
Undermine
erode the base or foundation of (a rock formation).