Element A has 4 valence electrons while C has 6. In the answer it is written that both of them have 4 valence electrons. As per my understanding the correct option is C. Please guide me correctly.

Element A has atomic number 6. So the electronic configuration is 2,4.

Element C has atomic number 32. So the electronic configuration is 32.

 

Both the elements A and C have 4 electrons in their outermost shell.

 

So they both belong to the same group 14.

 

So the correct option is B.