The numerator of a fraction is increased by 20% and its denominator be diminished by 10%. The value of the fraction is\[{{b}_{1}}\] , then the fraction is

• A.  \[\frac{{{a}_{1}}}{{{b}_{1}}}=\]      
• B.  \[{{a}_{2}}\]
• C.  \[{{b}_{2}}\]        
• D.  \[\frac{{{a}^{2}}}{{{b}^{2}}}=k\]