Tetravalent
We have already seen an example of how a covalent bond can form between two hydrogen atoms producing molecular (H2) as opposed to the atomic form of hydrogen. ... As in all its compounds and its elemental forms, carbon is tetravalent, which means that it always forms four bonds.
Answer: B
Explanation: It’s quite a complex subject that you’d probably have to research into. But take it form someone who experienced depression and weight gain because of improper sleep and an abusive environment. Note: remember to sleep and eat healthy!! :) <3