Adomestic initiative that president nixon was responsible for was the reduction of interest rates. the formal recognition of china. negotiating the salt i agreement. creating the environmental protection agency.

Correct  Creating the Environmental Protection Agency

Explanation/detail:

The formal recognition of China and Strategic Arms Limitations Talks (SALT) were foreign policy initiatives (not domestic).

As to interest rates, during the Nixon presidency, the Federal Reserve chairman, Arthur Burns, had begun raising interest rates.  In 1971, President Nixon exerted pressure on Burns and "the Fed" to keep interest rates down, but that only led to a decade of high inflation that caused other economic problems. So that was not a success for Nixon.

About the Environmental Protection Agency

President Nixon signed an executive order establishing the Environmental Protection Agency in 1970.  Subsequent committee hearings in the House of Representatives and the Senate ratified Nixon's order for the creation of the agency.  

Environmental issues had been gaining much attention during the 1960s, and the need for oversight became clear.  As Lily Rothman reported in a TIME magazine article:

- "Here's Why the Environmental Protection Agency Was Created," TIME, March 22, 2017

Nixon's administration felt it necessary to take action to address pollution problems in the American environment.

the nationalists wanted a strong central government so the new country wouldn't fall apart.

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