haley rubs a cotton cloth along a plastic strip. the plastic strip becomes positively charged. why did this happen? the plastic strip gained protons from the cotton.
the plastic strip lost protons to the cotton.
the plastic strip gained electrons from the cotton. or, the plastic strip lost electrons to the cotton.

When two different materials are rubbed together, there is a transfer of electrons from one material to the other material. This causes one object to become positively charged (the electron loser) and the other object to become negatively charged (the electron gainer).

When you rub two things together, one object transfers it;s electrons to another. The object which loses electron becomes positively charged, and which gains, become negatively charged. Here, Plastic strip lost electrons to the cotton so become positively charged.

In short, Your Answer would be Option D

Hope this helps!