Please help with this I don’t understand!

Sarah rubbed a comb with a wool cloth. She then placed the comb near a piece of paper. Sarah observed that the paper was attracted to the comb. Why do you think rubbing the comb with the wool caused the paper to be attracted to the comb? Create a Google Document on which you answer this question. Be certain to give a complete explanation of what is happening to create the attraction.

When the comb is rubbed then it provides the comb static charges due to which when it is brought near to the pieces of paper , the pieces are attracted by it.

Explanation:

Like when the comb is rubbed then some of its electrons are removed giving it a positive charge and then these positive charge will attract the paper due to paper's negative charge that are electrons.

Hope this answers your question.

answer; i believe that the correct answer is (d) a very small amount of mass

a and b sometimes have a positive value