Which of the Following Ranks the Elements Carbon, Sodium, Calcium $\rightarrow$

Which of the following ranks the elements carbon, sodium, calcium, and iodine in order of decreasing number of valence electrons?

A) C $\rightarrow$ Na $\rightarrow$ Ca $\rightarrow$ I
B) I $\rightarrow$ Ca $\rightarrow$ Na $\rightarrow$ C
C) I $\rightarrow$ C $\rightarrow$ Ca $\rightarrow$ Na
D) C $\rightarrow$ Ca $\rightarrow$ Na $\rightarrow$ I