Technically, Satan wanted power, Adam and Eve wanted knowledge. They wanted things that belonged to God and God alone, and they were punished for it.
so it can be either b or c not sure though.
NaF is not covalent, but ionic, as Na and F are on opposite sides of the periodic table.
No one can really help you on this, this is a question that you should be asking yourself and writing on your own. Ask yourself "what can I do better, what can I do differently that will help me improve"
