Ne group of students is investigating the properties of charged objects. their observations are listed below.
when two positively charged objects are brought close to each other, they push each other away.
when two negatively charged objects are brought close to each other, they push each other away.
when a positively charged object is brought close to a negatively charged object, they pull toward each other.
the experiment was repeated by several students using different charged objects. the results were the same. based on the investigations, which of these theories would the students most likely propose?

similar charges attract
similar charges repel
positive charges attract all charges
negative charges attract all charges