When `0.2 kg` of brass at `100 .^(@) C` is dropped into `0.5 kg` of water at `20 .^(@) C`,the resulting temperature is `23 .^(@) C`. The specific heat of brass is.
A. `0.41 xx 10^3 Jkg^-1 .^(@) C^-1`.
B. `0.41 xx 10^2 Jkg^-1 .^(@) C^-1`.
C. `0.41 xx 10^4 Jkg^-1 .^(@) C^-1`.
D. `0.41 Jkg^-1 .^(@) C^-1`.