In which year was the total export (in million tonnes) of wheat and rice between 200 and 225?

Checking the Export for all of the options we see:
Option A: 2017
Wheat Export - 40% of 180 = 72
Rice Export - 28% of 200 = 56
Total Export - 128

Option B: 2019
Wheat Export - 35% of 320 = 112
Rice Export - 48% of 300 = 144
Total Export - 256

Option C: 2020
Wheat Export - 30% of 360 = 108
Rice Export - 40% of 280 = 112
Total Export - 220

Option D: 2018
Wheat Export - 45% of 240 = 108
Rice Export - 32% of 250 = 80
Total Export - 188

As we can see, only option C satisfies our condition.
Therefore, Option C is the correct answer.