The question asks to arrange the given items in order of decreasing extension. In the context of classification or set theory, "extension" refers to the set of all individuals or objects that fall under a particular concept or category. Therefore, decreasing extension means arranging from the broadest category (including the most items) to the narrowest category (including the fewest specific items).

Arranging Items by Decreasing Extension

Let's analyze the relationship between the given items:

• B. Food products: This is the broadest category, encompassing all edible substances.
• C. Dairy products: This is a subcategory of food products. Dairy products are foods produced from or containing the milk of mammals.
• A. Cheese: This is a specific type of dairy product, made from milk.
• D. Cottage cheese: This is a specific type of cheese, making it a narrower category than cheese in general.

Order of Decreasing Extension

Based on the analysis, the categories arranged from the broadest (most extensive) to the narrowest (least extensive) are:

1. B. Food products (Most extensive)
2. C. Dairy products (Less extensive than food products)
3. A. Cheese (Less extensive than dairy products)
4. D. Cottage cheese (Least extensive)

Therefore, the correct order of decreasing extension is B, C, A, D.

Matching with Options

Comparing this order with the given options:

• Option 1: A, D, C, B
• Option 2: C, B, A, D
• Option 3: B, C, A, D
• Option 4: D, A, C, B

Option 3 correctly represents the order of decreasing extension.