(A) Corporations from Europe are welcomed in the United States
(B) There are no limits to immigrants from Europe
(C) Japan is allowed to travel through Russia
(D) ** All nations can trade with China
EXPLANATIONS BELOW
Concept note-1: -The Open Door policy was a statement of principles initiated by the United States in 1899 and 1900. It called for protection of equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity.
Concept note-2: -The United States of America (USA) did not have any influence against the exclusive trading rights possessed by Europeans. Therefore, the USA proposed that trade in China be open for all the nations in the world. This statement came to be known as the Open Door Policy of 1899.