When do some atoms in covalent bonds become slightly negative or slightly positive

A covalent bond is the force of attraction that holds together two atoms that share a pair of electrons. It forms between atoms of the same or different nonmetals. In polar covalent bonds, one atom attracts the shared electrons more strongly and becomes slightly negative. The other atom becomes slightly positive

Explanation:

hope this helps

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a