A student gathered two boxes of the same size made of different materials: glass and clear plastic. She placed them on a windowsill in the sun for an hour, and then measured the temperature of the air in each box.
Which statement best describes the purpose of the experiment?

•to relate the type of box material to the temperature of air within the box

•to relate the size of the box to the temperature of air within the box

•to relate the type of box material to the mass of the box

•to relate the amount of time a box is exposed to sunlight to the temperature of air within the box