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You can do that by using "Page Break" feature and "Conditions". I created a demo form (http://support.jotform.com/form/50301611514943). Please check it and verify if this is what you wanted to happen. Here's a guide if you need to clone the form.
I use the "Page break" function to create 3 pages. Page 1 = option 1 or option 2, Page 2 = Form A, Page 3 = Form B
After that, I created a conditions wherein if you chose option 1 and press next, it will go to page 2. So if the user chose option 2, it will jump to page 3.
Hope this helps. Let us know if you need further help.