The pair BRAND : PRODUCT indicates a relationship in which the first term is a brand name and the second term is a category of product that the brand represents.
We are looking for a similar relationship where one word is a brand and the other is the product or category it belongs to. Let's evaluate the options:
Option (a) Dalda : Rath – Both are brand names; this is brand : brand, not brand : product. So it does not match.
Option (b) Aircraft : Flying Machine – This is a category : category relation or synonym-like. Not a brand-product relation.
Option (c) Shoes : Reebok – This is product : brand, the reverse of what we want.
Option (d) Sports car : Automobiles – This is the correct analogy. A sports car is a type of automobile, just as a product is a type under the broader category a brand represents. While it's not brand-specific, the logic of type : category matches closely with the original structure.
Therefore, the best option expressing a similar relationship is:
(d) Sports car : Automobiles