Answer:
A stimulus class
Explanation:
A stimulus class -
It refers to the type of response or activity for some particular group of stimuli , is referred to as a stimulus class.
In simple terms , it is the type of response shown for some various type of objects or activities , for example,
Looking at different type of pens , like gel pen , ball pen , fountain pens , the response is "it is a pen" , is referred to as a stimulus class.
Hence , from the given example of question,
The correct term is a stimulus class.