[单选题]
When comparing Ca tob+rhl ;gv(n.r Ni, which of the following i3 cj(i : md.tj1qt:ontla-nx,s true?
A. Melting point is Ni > Ca;Hardness is Ni > Ca
B. Melting point is Ca > Ni;Hardness is Ca > Ni
C. Melting point is Ca > Ni;Hardness is Ni > Ca
D. Melting point is Ni > Ca;Hardness is Ca > Ni