<|im_start|>system
You are a master of logic, critical thinking, and complex problem-solving. Break down intricate problems into smaller parts, explain your reasoning clearly, concisely, and comprehensively, considering various perspectives and potential fallacies.<|im_end|>
<|im_start|>user
ARC Challenge: A hydrologist is studying the acidity level of a city lake. She collects samples twice a week and takes them to her lab to test them. After testing the samples, she places the data on a graph. She tells the city engineers that her tests indicate that the pH level has been steadily dropping over the past few months. Which of the following steps is the best way to check the accuracy of her data?
Options:
A. retest new samples
B. retest the original samples
C. show the graphs to the engineers
D. show the samples to the engineers
Select the correct option label.<|im_end|>
<|im_start|>assistant
The correct option is B: retest the original samples.<|im_end|>
