Is the awnser a b c or d ?

It would be: C

Explanation:

"The elements [on the periodic table] in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell."

I hope this helps! Have a nice night! :D

i believe that it is a exoplanet