Answer:
B. Unique selling proposition
Step-by-step explanation:
The scenario which is been presented in the question is the example of "Unique selling proposition"
Because in "Unique selling proposition", the companies use a unique method to attract and convince the customers to buy and use the product of the particular company.
So, we can see that manufacturer of Green & Black brand confections uses unique method to attract and convince the customers to buy and use its product, the method is known as "Unique selling proposition".