The concentration of a solution is changed from 0.2 to 0.4, then what will be rate and rate constant. The reaction is of first order and rate constant is K = $1\times 10^{–6}$ :

Question

( A ) $1\times10^{–7} ; 1\times 10^{6}$
( B ) $2 \times10^{–3} ; 1\times 10^{–3}$
( C ) $4 ×10^{–7} ; 1\times 10^{–6}$
( D ) $2\times10{–7} ; 1\times 10^{–6}$