The quiz is not timed but I need to bring my grade up in chemistry, I am pretty sure it is D but I am not 100% sure. In order for hydrogen bonding to occur in a molecule there needs to be a hydrogen bonded to a small, highly electronegative like:

A. nitrogen

B. oxygen

C. fluorine

D. All of the above

you didnt put any of the following

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.

yes the answer is total mass in unchanged   : )