The correct statement is option B) “some words that are usually nouns can function as adjectives”. Sometimes nouns can function as adjectives depending on their placement within the sentence
Option A is incorrect since adjectives cannot modify adverbs.
Option C is also incorrect since an adjective only modifies nouns
Option D is also incorrect since adverbs do not modify nouns. Adverbs modify an adjective, a verb, a clause, and another adverb.
She could argue that you don't need to sell the same thing every year and therefore, we could all try something different this year, not just candy.
She also could argue that candies are not healthy and it's time to distance ourselves from them for now.
The best argument that she could pull off would be, if that was really the case, if fruits were easier and more profitable to sell. By far, if that was the argument, they would all sell fruit easily.