The second note of Secretary of State Hay's Open Door policy with China addressed . a. Japan's invasion of China. b. Russian movement into Manchuria. c. German movement into Poland. d. British movement into Australia.

a. Japan's invasion of China.      

Explanation:

The second note of Secretary of State Hay's Open Door policy with China addressed Japan's invasion of China. The second note of Secretary of State Hay's Open Door policy also known as Hay's second policy was aimed at preserve China's territorial and administrative integrity during the Sino-Japanese War.

Japan's invasion of China ( A )

Explanation:

The second note of secretary of state Hay's Open Door policy with China helped to address the invasion of China by the Japanese also for other world powers like France, Britain, and other world powers because it was a foreign policy made by the U.S to create an equal amount of privileges for countries who trade with China and also for the territory of China to be respected as well

The Japanese were not happy that the trades in China were controlled by western / European powers and they wanted to expand their territory and control Asia and the trades in China and also they were running out of  resources to trade with China.and this led to the invasion of China's territories by Japan. but the open door policy addressed all of this situations