Answer:
Overstate, understate, understate, zero is the correct answer
Explanation:
The trading note was for three years, but Gannon reported it as revenue in 2016 itself, which is why the net earnings are exaggerated. Similarly, he does not report proportionate revenues related to the trade mark in 2017 and 2018, as he had already reported all of them in 2016 as a result of net earnings for 2017 and 2018 being understated. The trading note does not therefore have an impact on 2018's net earnings.