Question

Please test tomorrow:the process in which particles move through a membrane from a region of high concentration to a region of low concentration

A diffusion
B passive transport
C active transport
D fermentation

Answer 1

The answer is not fermentation that is something totally different.
So now you have 3 choices.
Diffusion there is no membrane so that is not it.
Active transport requires energy, that is not mentioned in the question.

So you are left with one answer A. Osmosis