A

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

B

$\displaystyle\int_e^{+\infty}\dfrac{\ln^2x}{x}dx$

C

$\displaystyle\int_e^{+\infty}\dfrac1{x\ln^2x}dx$

D

$\displaystyle\int_1^{+\infty}\dfrac{x}{1+x^2}dx$