Which have melting point below 500°C?

Correct option is B. Zn, Cd
Solution:- (B) Zn, Cd
M.P. for Cadmium is 321.07°C and M.P. for Zn is 419°C
M.P. Cu = 1084°C
M.P. Ag = 961°C
Zn, Cd has very low melting point due to low heat of atomization and weak metallic bond.