Final answer:
a) Sugar-sweetened beverages. Sugar-sweetened beverages are not a common limiting factor regarding nutrition.
Step-by-step explanation:
The correct answer is a) Sugar-sweetened beverages. While all of the options listed can potentially be limiting factors regarding nutrition, sugar-sweetened beverages are not commonly considered a limiting factor. Consuming excessive amounts of sugar-sweetened beverages can have negative effects on health, such as weight gain and increased risk of chronic diseases, but it is not typically considered a common limiting factor for overall nutrition.