Look at the outline of the US Constitution below: The US Constitution

I.
II. Article I: The Legislative Branch
A. Section 1
B. Section 2
C. Section 3
D. Section 4
E. Section 5
F. Section 6
G. Section 7
H. Section 8
I. Section 9
J. Section 10
III. Article II:
A. Section 1
B. Section 2
C. Section 3
D. Section 4
IV. Article III: The Judicial Branch
A. Section 1
B. Section 2
C. Section 3
V. Article IV: The States
A. Section 1
B. Section 2
C. Section 3
D. Section 4
VI. Article V: Amending the Constitution
VII. Article VI: The Supremacy Clause
VIII. Article VII: Ratification
IX. The and Amendments

Which of the following correctly completes line III. Article II: in the outline above?
A.
Bill of Rights
B.
The Preamble
C.
Checks and Balances
D.
The Executive Branch