Final answer:
Without the Canada Food Guide reference, we cannot accurately determine the correct serving size of popcorn by volume and weight to match CFG serving recommendations for grain products.
Step-by-step explanation:
The question pertains to the Canada Food Guide (CFG) Servings for Grain Products and is asking about the amount of popcorn that would constitute one serving.
According to health recommendations, a serving size is typically measured in both volume and weight.
However, the question does not provide enough information to determine the correct CFG serving size of popcorn; the size and weight of the serving have to be compared to the official CFG recommendations for grain products.
Without the reference information from the CFG, selecting an option from A) 2 cups, 25g to D) 8 cups, 100g would be a guess.
Science and math skills are employed here to understand the relationship between volume, weight, and serving size as it relates to nutrition information on food packaging.