Definition: You are given a question on marketing. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input:  The differentiation of a firm's products or services to promote environmental responsibility is referred to as:
(A)Social branding. (B)Eco-branding. (C)Me-too branding. (D)Brand personality.

B