10 mL of a `H_(2)SO_(4)` solution is diluted to 100 mL. 25 mL of this diluted solution is mixed with 50 mL of 0.5 N NaOH solution. The resulting solution requires 0.265 g `Na_(2)CO_(3)` for complete neutralization. The normality of original `H_(2)SO_(4)` solution is :
A. 12 N
B. 11 N
C. 3N
D. 0.275 N