Find the sum of the given expression \[-5{{x}^{2}}+3x-8,4x+7-2{{x}^{2}}\]and \[\mathbf{6}-\mathbf{2x}+\mathbf{2}{{\mathbf{x}}^{\mathbf{2}}}\]

• A.  \[2x+3y+z\]  
• B.  \[x+2y+3z\]
• C.  \[9x+6y+4z\] 
• D.  \[-5{{x}^{2}}+5x+5\]