In an experiment to determine the specific heat of a metal,` a 0.20 kg` block of the mental at `150 .^(@) C` is dropped in a copper calorimeter (of water equivalent `0.025 kg` containing `150 cm^3` of water at `27 .^(@) C`. The final temperature is `40.^(@) C`. The specific heat of the metal is.
A. `0.1 Jg^-1 .^(@) C^-1`.
B. `0.2 Jg^-1 .^(@) C^-1`.
C. `0.3 cal g^-1 .^(@) C^-1`.
D. `0.1 cal g^-1 .^(@) C^-1`.