Under which article can a president expand their powers in times of national crisis?
a. article 1
c. article 3
b. article 2
d. article 4

Article 2 allows a President to expand their powers in times of national crisis. The correct option among all the options that are given in the question is option "b". Article 2 of the United States Constitution mainly deals with the executive branch of the federal government. This article also gives the President the expand his powers if required during the time of national crisis.