$A$ galvanometer with its coil resistance $25\,\Omega$ requires a current of $1\,mA$ for its full-scale deflection. In order to construct an ammeter to read up to a current of $2\,A$,the approximate value of the shunt resistance should be:

• A
  $2.5 \times 10^{-2}\,\Omega$
• B
  $1.25 \times 10^{-3}\,\Omega$
• C
  $2.5 \times 10^{-3}\,\Omega$
• D
  $1.25 \times 10^{-2}\,\Omega$