I've seen this question and there weird because wtf are you supposed to write for 5 marks.
What you've written is basically what I've seen as sample answers for this type of question. They go through everything and then get to organ of corti.
Nah for standard you need a related text for everything but mod B.
Having one related text limits you. What if the hsc question doesn't fit your related? You're screwed. They can ask for 2.
So minimim is 2 however I think 3 is really good.