Question: A teacher gives a student an unknown liquid and wants the student to find the boiling point of the liquid. The student performs the investigation and finds the boiling point is 50°C and then repeats the experiment and finds the boiling point is 70°C. How should the student best identify the boiling point?

  Options: 
 A. use the second boiling point
 B. average the two numbers
 C. use the first boiling point
 D. repeat the investigation 
Answer: D