Federalism is a system of government with two distinct power structure. It is divided between a National/Central government and Local/ Regional governments.
The authority of power is divided at dual level to ensure proper functioning of the government. The National government holds complete authority over the nation but it does not interfere in the powers bestowed upon local government. They both work independently but under the guidance of National government. Some extreme cases involve both of these whereas some cases do not.
In short the division of power is an essential tool to create a balance and share of government's responsibility.
The correct answer is letter C. It is also known as "lightning war." A military tactic that occurs fast and attacks the enemy's weak points through the use of armor and air power. This type of tactic preserves innocent human lives and lessens artillery cost.