The Open Door Policy in China said that all foreigners would have equal trading rights in China true or false?

True. The Open Door Policy was founded in the 1900's when US was trying to have good trading with China. The Open Door Policy said that it wanted to perserve the integrity of China, and "asked" many other countries to trade equally with one another.

The truth is: it's not 100% true. Even the policy maker want to do so it's a goal not easy to reach. The main reason is China has many national owned business (industry or bank) which still play main role in China economy. For a foreign company what very possibly happens is all of a sudden this company finds out he is competing with a company backed up by Chinese government.