What are two pieces of information that the sunscreen manufacturer might include on the label to you decide if thhe sunscreen will be effective

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.

yup its correct its: c) b b