Considering the situation described in the question, this is considered a "Stimulus diffusion, because the Europeans adopted a Chinese concept to fit their own needs."
This is because Stimulus diffusion is a type of diffusion in which ideas originate from one culture and move to another but are then refined or modified to fit the needs of the new places.
Thus, given that Germany and England developed the method of making porcelain originally from China, this is a good example of stimulus diffusion.
Hence, in this case, it is concluded that the correct answer is Stimulus diffusion.
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