In which of these samples do the atoms have the greatest kinetic energy? (3 points) liquid iron (2,000°c) liquid iron (1,600°c) solid iron (65°c) solid iron (25°c)

Answer is: atoms have the greatest kinetic energy in liquid iron (2,000°C).
The average kinetic energy of molecules depends on the temperature. 
At high temperature(2,000°C), molecules of iron have greater kinetic energy than molecules of iron at low temperature (1,600°C, 65°C and 25°C)..