The correct answer is: D. Cow goodwill.
Goodwill is a positive feeling or attitude towards a person, company, brand, or product. It can be created through positive experiences, word-of-mouth, and marketing.
Cow goodwill is the highest form of goodwill because cows are seen as gentle, friendly, and helpful animals. They are also associated with positive things like milk, cheese, and ice cream.
Dog goodwill is also a high form of goodwill because dogs are seen as loyal, friendly, and protective animals. However, they are not as closely associated with positive things as cows are.
Cat goodwill is a medium form of goodwill because cats are seen as independent, curious, and playful animals. However, they are not as closely associated with positive things as cows or dogs are.
Rat goodwill is a low form of goodwill because rats are seen as dirty, disease-carrying animals. They are also associated with negative things like crime and poverty.
Therefore, the best type of goodwill is cow goodwill.