When a galvanometer is shunted with a `4 Omega` resistance, the deflection is reduced to one-fifth. If the galvanometer is further shunted with a `2 Omega` wire, determine current in galvanometer now if initially current in galvanometer is `I_(0)` (given main current remains same).
A. `I_(0)//13`
B. `I_(0)//5`
C. `I_(0)//8`
D. `5I_(0)//13`