A

$\displaystyle\int_2^{+\infty}\dfrac{\ln x}{x}dx$

B

$\displaystyle\int_1^{+\infty}\dfrac1{\sqrt{x}}dx$

C

$\displaystyle\int_1^2\dfrac1{\sqrt{x-1}}dx$

D

$\displaystyle\int_1^{+\infty}\cos x\,dx$