Bob conducted an experiment in the school yard. He had his classmates run 100 meters and recorded the time it took each classmate to run the distance. He also recorded the gender of each classmate. What question was Bob trying to answer with the experiment?
A.
How tall is the average student?
B.
How quickly can students run 1 kilometer?
C.
Do girls or boys have longer hair?
D.
Do girls or boys complete the 100-meter dash faster?