I’m pretty sure the correct answer is C
I like Olivia too. Not really sure why this is a brainly question tho lol.
Answer: Not 100% sure but I think it’s C.
Explanation: Hope this helps! ^^
A polyatomic ion is a group of atoms bond by covalent bonds with an unbalanced charge. A binary ionic compound is composed of atoms of two elements bond by an ionic bond.