Classical Conditioning and Stimulus Generalization

In a series of experiments examining classical conditioning, a researcher conducted a study aiming to identify the effects of different reinforcement schedules on the acquisition of conditioned responses. In this scenario, the researcher presented a neutral tone (Conditioned Stimulus, CS) followed by an electric shock (Unconditioned Stimulus, US) to a group of rats. As conditioning progressed, the rats began to show signs of fear when only the tone was presented. Which of the following best describes an important aspect of this scenario related to the concepts of stimulus generalization and discrimination?