If \[{{\left( \frac{3}{2} \right)}^{2}}\times {{\left( \frac{3}{2} \right)}^{a+5}}={{\left( \frac{3}{2} \right)}^{8}},\]then a=____.

• A.  \[-1\]                          
• B.  0                    
• C.         1                    
• D.         2