Discussion

Explanation:

Let the total production of crops in the USA, World and ROW be denoted by U, W and R, respectively.
Thus, 0.2(U) = 0.8[0.2W - 0.2U]
0.36U = 0.16W

U = $\frac{4}{9}$W
Thus, production of soybean in the USA = 0.25U = 0.25 x $\frac{4}{9}$W = 0.25 × $\frac{4}{9}$ × 160 = 17.75 million tonnes.
Hence, the answer is option D.

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