$100 \mathrm {~g} 98 \%$ by weight $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ is mixed with $100 \mathrm {~g} 49 \%$ by weight $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$. Mole fraction of $\mathbf { H } _ { \mathbf { 2 } } \mathbf { S O } _ { \mathbf { 4 } }$ in solution is
(A) 0.9
(B) 0.1
(C) 0.67
(D) 0.34