Help Aileen wants to see which type of pencils stays sharp longer, wooden pencils or mechanical pencils. She has observed both types of pencils being sharpened throughout the day. What is the next step if Aileen wants to conduct an experiment determining which type of pencil stays sharp longer?
a. Aileen must form a hypothesis.
b. Aileen must form an explanation.
c. Aileen must conduct an experiment.
d. Aileen must conduct a lot of research.