While researching wave behavior, a student has taken the following notes:
- A researcher sent identical transverse pulses along the same spring in two trials.
- In the first trial, the far end of the spring was secured to a wall.
- In the second trial, the far end was attached to a ring that could move freely.
- The secured end produced an inverted reflected pulse, while the freely moving end produced an upright reflected pulse.
- In both trials, the reflected pulse had a smaller amplitude than the incoming pulse.
The student wants to use evidence from the trials to support the claim that a boundary's constraints, rather than a pulse's initial properties, determine whether the reflected pulse is inverted. Which choice most effectively uses relevant information from the notes to accomplish this goal?