a positively-charged wool sock and a neutral plastic bag a neutral cotton sweater and a negatively-charged plastic pellet a negatively-charged balloon and a positively-charged piece of paper a negatively-charged plastic strip and a negatively-charged piece of cloth
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which pair of items will repel each other?
Possibilities:
- a positively-charged wool sock and a neutral plastic bag
- a neutral cotton sweater and a negatively-charged plastic pellet
- a negatively-charged balloon and a positively-charged piece of paper
- a negatively-charged plastic strip and a negatively-charged piece of cloth

a negatively-charged plastic strip and a negatively-charged piece of cloth