Answer:
The correct answer is - repetition.
Step-by-step explanation:
Repetition is one of the verification process used in a scientific investigation or experiments to verify or investigate one's own investigation accuracy. In such verification, the researcher repeats its process to check the accuracy and used to check observations are correct.
In the given question Cassidy using repetition by repeating her observation for seven days at the same time 5 P.M. in the park.