A company's new eco-friendly dish soap is an extension of its current dish soap line. What type of adopters would probably be most interested in it?

The company would most probably be interested in early majority.

Explanation:

Adopter categories split consumers into sections on the basis of their willingness to try out new innovations or products. The categories of adopters had been first given the name and defined by social scientist Everett Rogers in 1962 in the famous book Propagation of Innovation.

Adopter categories as a concept for the propagation of the theory of creativity are extended to several studies, amongst others, marketing, administrative studies, management of information, communications and research of complexity.

Early majority: If this group joins an idea or some other innovation, it appears to be adopted by the public shortly. This group makes useful decisions and practical advantages over coolness.