Tính \(I = \int {\sin \left( {3x - 1} \right)dx} \).
A.\(I = \cos \left( {3x - 1} \right) + C\)
B.\(I = \frac{1}{3}\cos \left( {3x - 1} \right) + C\)
C.\(I = - \frac{1}{3}\cos \left( {3x - 1} \right) + C\)
D.\(I = - \cos \left( {3x - 1} \right) + C\)