The examples of increased centralization of power among the options you provided are:
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the Commerce Clause: This clause has been used by the federal government to expand its powers over interstate commerce, leading to increased central authority.
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the Incorporation Doctrine: This legal doctrine applies the Bill of Rights to the states through the Fourteenth Amendment, leading to greater federal oversight of state laws and actions.
The Comity Clause, Due Process Clause, and Nullification Doctrine do not primarily represent an increase in centralization of power. The Comity Clause promotes mutual respect between states, the Due Process Clause ensures fair legal proceedings, and the Nullification Doctrine historically supports the idea that states can nullify federal laws, which actually reflects a decentralization of power.