The "supersizing" phenomenon that has become widespread over the past 30 years refers to the

Explanation:

The idea that it is okay to make portions larger and that the consumer not only agrees with the idea but purchases the larger size also

refers to the substantial growth in the amount of meals, snacks and beverages purchased.

Explanation:

The supersizing phenomenon refers to the moment when there has been a substantial increase in the quantity of meals, snacks and beverages purchased. This phenomenon happened because the price of some foods, such as fast food, for example; presented a very low price in relation to the marginal costs of production. This has led to increased sales of these products, allowing higher consumption, and consequently greater purchase, of some meals and drinks.

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a is the answer because it just is