[单选题]
When comparing Ca to Ni, whic804 do ysblk9nvl++qr ,) ) qj-qkwfvxh 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