Answer: Creation of a judicial branch
Explanation:
The options to the question are:
a. Creation of a judicial branch
b. Creation of a national bank
c. Creation of the Electoral College
d. Creation of the Monroe Doctrine
One way that the Constitution of the United States expanded the power of the central government is the creation of a judicial branch. The judicial branch is in charge of interpretation and application of law and also settling of legal disputes.
The Monroe Doctrine simply states that with regards to the politics in America, an intervention by external powers will be considered dangerous to America.
The electoral college are electors who employ the president and the vice president. The creation of national bank isn't a way the U.S constitution expanded the power of the central government.
From the explanation, the answer is "creation of a judicial branch".