Rank the Elements Carbon, Phosphorus, Calcium, and Iodine in Order $\rightarrow$

Rank the elements carbon, phosphorus, calcium, and iodine in order of decreasing number of valence electrons.

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