Step 1: Identify the Taglines.
- Mercedes: The tagline "The best or nothing" is well-known and associated with the brand Mercedes.
- Porsche: "There Is No Substitute" is the tagline for Porsche, emphasizing the uniqueness of their vehicles.
- Ford: "Built Ford Tough" is a popular tagline used by Ford to describe the durability of their vehicles.
- Audi: "Vorsprung durch Technik" translates to "Advancement through Technology" and is Audi's famous tagline.
Step 2: Conclusion.
The correct tagline for each brand is:
- Mercedes: (a) "The best or nothing"
- Porsche: (b) "There Is No Substitute"
- Ford: (c) "Built Ford Tough"
- Audi: (d) "Vorsprung durch Technik"