A 10-Kg Piece of Marble at 100^oC Is Dropped into 2

A 1.0-kg piece of marble at 100^oC is dropped into 2.5 kg of water at 1.0^oC and the resulting temperature is 7.0^oC. The specific heat of the marble is approximately

A) 0.16 kcal/kg · C^o.
B) 0.75 kcal/kg · C^o.
C) 0.61 kcal/kg · C^o.
D) 0.30 kcal/kg · C^o.
E) 0.26 kcal/kg · C^o.