An ammeter reads upto $1A$. Its internal resistance is $0.81 \Omega$. To increase the range to $10 \;A$, the value of the required shunt is:

Question

( A ) $0.03 \Omega$
( B ) $0.9 \Omega$
( C ) $0.3 \Omega$
( D ) $0.09 \Omega$