Tìm nguyên hàm
$\int{{\sqrt{{x-1}}dx}}.$
A. $\displaystyle -\frac{3}{2}\sqrt{{{{{(x-1)}}^{3}}}}+C.$
B. $\displaystyle \frac{2}{3}\sqrt{{{{{(x-1)}}^{3}}}}+C.$
C. $\displaystyle -\frac{2}{3}\sqrt{{{{{(x-1)}}^{3}}}}+C.$
D. $\displaystyle \frac{3}{2}\sqrt{{{{{(x-1)}}^{3}}}}+C.$