Ontario Highway Traffic Act

I recently got ticketed for speed 20km over the posted limit. Frankly, i do not recall if i was speeding at 70km on a 50Km zone.
There were 2 cars infront of me, so don't recall that exact moment. Anyways my question is
1) can i check option 3 (I intend to appear in court to enter a plea of not guilty at the time and place set for trail and i wish ...