3. Which of the following declared America's intent to safeguard China's political and economic

integrity and open Chinese markets to all nations?

A. The Teller Amendment

C. The Platt Amendment

B. The Foraker Act

D. The Open Door Policy

The Open Door Policy declared America's intent to safeguard China's political and economic integrity and open Chinese markets to all nations.

Answer: Option D

Explanation:

Open Door Policy, a response by the United State of America after realizing the need for safeguarding China's political and economic integrity and open Chinese markets to all nations.

This was a joint action taken by the United States of America along with nations like Italy, Japan, Germany, Russia and France. This is considered as a milestone in the external affairs policies of the United State of America. This policy was taken in 1899 and 1900.