Bus drivers in Ontario have an exemption from the ban on the use of hand-held two-way radios until what year?

Answer: B — 2021

This is incorrect because the exemption for bus drivers in Ontario is actually until 2021, not 2020. Option A is incorrect because it is already the year 2020 and the exemption would have expired by now. Option C and D are both incorrect as they are both after the year 2021, when the exemption expires. Therefore, the only correct answer is B, 2021.