[单选题]
When comparing Ca to Ni, 9 d qe:uo8d-nz7+atd-7p qyh*sm dav*whicv5 dpe k:y4-9j,a ujc1zj3vnah of the following is 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