The correct answer is "B".
There are certain circumstances that lead to nationwide emergencies which demand urgent action from the government in order to stabilize the ongoing situation. Examples of these cases are economic downfalls such as the financial crisis of 2008 and the great depression of 1929. Events that lead to a menace regarding the nation's safety like wars, also require a fast action from the government.
The Executive branch often searches for legal means in order to obtain fast power during these events.