The above approach would add three related tables that would be named "Option1", "Option2", and "Option3" and have each of the questions within them.
However, I think what you are looking for would be something like this -
Begin Repeat Name of Related Table
Starting Main Question (The answer to this select one will dictate which Option question set is exposed)
Begin Group Option1 Relevant Column equals ${Main Question}=Option 1
Question 1
Question 2
End Group Option1
Begin Group Option2 Relevant Column equals ${Main Question}='Option 2'
Question 1
Question 2
Question 3
Question 4
End Group Option2
Begin Group Option3 Relevant Column equals ${Main Question}='Option 3'
Question 1
Question 2
Question 3
End Group Option3
End Repeat Name of Related Table
This should give you all of the questions within one related table and the ability to expose only the question groups that you want to expose.
Mike