Compared to the food demand in the year 2010, the demand in the year 2020 has…

Concept: A quantity has "at least doubled" between two years only when its later value is greater than or equal to twice its earlier value, that is, only when (2020 value) ÷ (2010 value) ≥ 2. The test is always the ratio and never the size of the absolute increase, because a commodity growing by a huge number of tonnes from a large base can still fall short of doubling, while a commodity growing by a small number of tonnes from a small base can cross the threshold comfortably.

Application: For each commodity offered here, double its 2010 demand to get the doubling threshold, then compare that threshold with its 2020 demand.

Cross-check: A second route confirms the same reading. Milk records the largest absolute rise in the whole table, 287.5 − 146.2 = 141.3 million metric tonnes, yet its ratio 287.5 ÷ 146.2 ≈ 1.97 stops just short of 2. Meat, Fish and Egg rises by only 28.3 − 13.6 = 14.7 million metric tonnes, but it starts from a small 2010 base of 13.6, so its ratio 28.3 ÷ 13.6 ≈ 2.08 crosses the threshold. Ranking the commodities by absolute growth would therefore point to the wrong commodity; ranking them by ratio is exactly what the phrase "at least doubled" demands.

Only Meat, Fish and Egg satisfies the at-least-doubled condition, so it is the required commodity.