Consider a reaction $\mathrm { A } \rightleftharpoons \mathrm { B }$ ．At＇T＇ K ，the equilibrium concentration of A and B are $\mathbf { 0 . 3 ~ M }$ and $\mathbf { 0 . 3 1 5 ~ M }$ ．Now， $\mathbf { 0 . 1 ~ m o l }$ of A is added to the flask of 1L，then equilibrium constant and equilibrium concentration of B are
（A） $1.05,0.35 \mathrm { M }$
（B） $0.95,0.37 \mathrm { M }$
（C） $1.05,0.37 \mathrm { M }$
（D） $0.95,0.35 \mathrm { M }$