The correct answer is B. Rocky intertidal.
Explanation
Adaptation to the environment is a term used to refer to the different means that organisms use to adapt to and survive in an environment. For example, humans have developed different means to adapt to the different climatic and environmental characteristics of the world. In the case of the glue secreted by algae and barnacles, it can be said that it is a means of adaptation to rocky intertidal environments, in which the glue is useful for sticking to the rocks of this medium and establishing itself where they find favorable conditions for their life. So, the correct answer is B. rocky intertidal
