PLEASE HELP WILL MARK BRAINIEST When recyclable materials are sent to a recycling plant, they are often not sorted in any particular way. Plastic materials might be mixed in with paper, iron, aluminum, and glass materials.

Which of the following is a way that recycling plants separate iron materials from other materials without applying a contact force to them?
A.
by applying an impact force to the recycled materials
B.
by sorting the materials with a robotic arm
C.
by applying a magnetic force to the recycled materials
D.
by sorting the materials by hand