Speeding can carry six demerit points in two different situations. What are they?

Correct answer: D. 50 km/h or more over anywhere, and 40 km/h or more over where the posted limit is under 80 km/h

Exceeding the limit by 50 km/h or more anywhere, and exceeding it by 40 km/h or more where the posted limit is under 80. Ontario's demerit schedule lists both in the six-point group: "exceeding the speed limit by 40 km/h or more on roads with a speed limit of less than 80 km/h" and "exceeding the speed limit by 50 km/h or more." The second entry is the one worth noticing, because it means the threshold is lower on slower roads — 40 over on a street posted at 50 or 60 lands in the same six-point bracket as careless driving and racing. Below that, the tiers step down: 30 to 49 km/h over is four points, and 16 to 29 km/h over is three.

Source: MTO Driver's Handbook: Understanding demerit points (ontario.ca) — six-point offences, speeding tiers