Gitlow v New York was a case of Free Speech, which is about the First amendment.
Mapp v Ohio, it was a case of a search and seizure and the supreme court decided that proofs obtained by unreasonable search and seizures cannot be used in State Law. It's about the 4th amendment.
Gideon vs Wainwright was the case that caused the decision that makes States to provide an attorney to the accused. Which is a 6th amendment case.
The correct answer is:
D. The incorporation of the First, Fourth, and Sixth amendments of the Bill of Rights
