For the reaction : <br> $2A+B\to 3C+D$ <br> Which of the following does not express the reaction rate:-

Question

( A ) $\frac{d[D]}{dt}$
( B ) $\frac{-d[A]}{2dt}$
( C ) $\frac{-d[C]}{3dt}$
( D ) $\frac{-d[B]}{dt}$