A researcher is training a dog to salivate to the sound of a bell. The graph below plots the strength of the dog's salivation response over time. The process is divided into three phases:

• Phase A: The bell is repeatedly paired with the presentation of food. The response strength increases rapidly.
• Phase B: The bell is presented repeatedly without any food. The response strength decreases steadily.
• Rest Period: No training occurs for a day.
• Phase C: The bell is presented again, and the graph shows a brief, moderate increase in response strength, which then diminishes.

Which statement provides the most accurate analysis of the events shown in the graph?