According to China's current trademark law and related regulations, the following statement is correct:

An application for trademark registration or other trademark matters can only be entrusted to a legally established trademark agency.

B. You can only apply for trademark registration or handle other trademark matters yourself.

Foreigners or foreign enterprises applying for trademark registration and handling other trademark matters in China shall entrust a legally established trademark agency to handle them.

Foreigners or foreign enterprises can apply for trademark registration and handle other trademark matters in China by themselves.

Correct answer: C.