If \[\left( \mathbf{a}+\mathbf{b} \right)=\mathbf{5},\] then find \[{{\mathbf{a}}^{\mathbf{2}}}-\mathbf{ab}+{{\mathbf{b}}^{\mathbf{2}}}\] (given \[{{\mathbf{a}}^{\mathbf{3}}}+{{\mathbf{b}}^{\mathbf{3}}}=\mathbf{8}\])

• A. 1.6
• B. 2
• C. 3
• D. 0