Thirty students in a science class each perform the same experiment and measure the temperature of a solution. Which will provide the most valid inference about the temperature of the solution?

A.
averaging the temperatures measured by five students whose names were picked from a stack of shuffled cards

B.
averaging the temperatures measured by five students who work together as a lab team

C.
averaging the temperatures measured by the six students with the highest scores on the last test

D.
averaging the temperatures measured by the first six students who enter the classroom the day after the experiment