Hannah Theorized That Sleep Helps People Act in Safer Ways

Hannah theorized that sleep helps people act in safer ways. She tested her theory by conducting an experiment. She manipulated the amount of sleep participants got and then tested participants' driving ability. Hannah learned that participants who got more sleep were safer drivers. In this example, Hannah's theory led her to _____.

A) replicate research
B) solve a developmental problem
C) generate a discovery
D) change the behavior of many people