When Chief Justice John Marshall wrote "A law repugnant to the Constitution is void" in the case Marbury v. Madison, what was he claiming?

AThe Framers should have taken more care designing the legislative branch.
BLaws unsupported by the Constitution are automatically unlawful.
CThe Supreme Court will take over lawmaking duties should it be necessary.
DThe Supreme Court has the right to declare laws of Congress unconstitutional.

3. D. The Supreme Court has the right to declare laws of Congress unconstitutional.
It was sort of a roundabout way in which the principle of judicial review was asserted by the Supreme Court in the case of Marbury v. Madison. William Marbury had been appointed Justice of the Peace for the District of Columbia by outgoing president John Adams -- one of a number of such last-minute appointments made by Adams. When Thomas Jefferson came into office as president, he directed his Secretary of State, James Madison, not to deliver many of the commission papers for appointees such as Marbury. Marbury petitioned the Supreme Court directly to hear his case, as a provision of the Judiciary Act of 1789 had made possible. The Court said that particular provision of the Judiciary Act was in conflict with Article III of the Constitution, and so they could not issue a specific ruling in Marbury's case (which they believe he should have won).