Respuesta :

Its either B or C. Its NOT A and D. I know that for a fact.

Hope this at least sorta helped. Have a good day! :D
Mn
This is an atom of Manganese


The second one is a compound of potassium oxygen and hydrogen, the third one is a compound of 2 hydrogens and a sulfer and the fourth one, while only containing one element, is still a molecule of 3 oxygen atoms - leaving Mn as your answer.