The domestic consumption of rice in 2019 was what percentage of the average production of wheat (per year) in 2017, 2018 and 2020?

Domestic consumption of rice in 2019: $$0.52\times\ 300\ =\ 156$$ million tonnes.

Average production of wheat in 2017, 2018 and 2020 is:
$$\frac{\left(180+240+360\right)}{3}=\ \frac{780}{3}=260$$ million tonnes.

Domestic consumption of rice in 2019 as a percentage of average production of wheat in 2017, 2018 and 2020 is $$\frac{156}{260}=0.6$$;
Which is equivalent to 60%

Therefore, Option D is the correct answer.