Regina is making observations of waves from different sources. She wants to classify the waves as either mechanical or electromagnetic. Which question will BEST help Regina to classify the waves? A.
Can the wave transfer matter?

B.
Can the wave transfer energy?

C.
Can the wave travel through a vacuum?

D.
Can the wave travel through a liquid?

A.  Can the wave transfer matter?

Explanation:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

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