On what ground can you say that scandium (Z = 21) is a transition element but zinc is not.

Question

$\begin{array}{1 1} \text{(a)As scandium have partially filled d-orbital in its ground state but Zn have partially filled p-orbital in its ground state that's why Zn is not considered as transition metal.} \\ \text{(b)As scandium have partially filled d-orbital in its ground state but Zn have fully filled d-orbital in its ground state that's why Zn is not considered as transition metal.} \\ \text{(c) As scandium have fully filled d-orbital in its ground state but Zn have partially filled d-orbital in its ground state that's why Zn is not considered as transition metal.} \\ \text{(d) As scandium have partially filled d-orbital in its ground state but Zn have fully filled p-orbital in its ground state that's why Zn is not considered as transition metal.}\end{array}$