Hey Wisnain,
You can diagram the logic in this question using arrows or diagrams to keep track of the author's argument, but it's worth noting that you often also need to consider the content of the stimulus to identify the flaw or method of reasoning, etc.
If we try and diagram this stimulus, we'll end up with conflicting logical relationships, at which point we need to figure out how/why that is, which is the flaw of the argument.
We're told psychotherapy
moral coercion.
But Coercion
choices restricted, and this is the opposite of the goal of psychotherapy.
So instead of relying on formal logic too deeply here, I can think about the actual content of what the author is saying - they assert that there is no way psychotherapy can be moral coercion because moral coercion contradicts the goal of psychotherapy. Once the stimulus is framed that way, it should be easier to see the flaw, which is answer choice (C).
Does that make sense?