The electrochemical equivalent of a metal is $3.3\times 10^{-7}\text{kg}$ per coulomb. The mass of the metal liberated at the cathode when a $3\text{A}$ current is passed for $2\text{seconds}$ will be:

1. A
   $19.8\times 10^{-7}\text{kg}$
2. B
   $9.9\times 10^{-7}\text{kg}$
3. C
   $6.6\times 10^{-7}\text{kg}$
4. D
   $1.1\times 10^{-7}\text{kg}$