Answer: correct option will D.
Explanation:
Calcium belongs to the group 2 i.e. of alkaline earth metals in periodic table. electronic configuration of calcium is [tex][Ar]4s^2[/tex].
So in order to attain noble gas configuration calcium will loose its two electrons during chemical bond formation.
[tex]Ca\rightarrow Ca^{2+}+2e^-[/tex]
Sulfur is a non metal which forms negatively charged ion so as to complete ts octet during chemical bond formation.
Helium is a noble gas with fully filled electronic configuration.
Carbon forms bond which is covalent in nature.
