Which represents the correct electron distribution of a transition element in the ground state?

a) 2-8-8-1
b) 2-8-8-2
c) 2-8-18-2
d) 2-8-18-3

I believe both C) and D) are correct, because both have enough electrons to show that the element has enough protons to be a transition metal, and both elements seem to have an electron configuration that exists in the ground state. We may need more information.