A

$\displaystyle\int_0^1dy\int_{y^2/2}^{y}f(x,y)dx$

B

$\displaystyle\int_0^2dy\int_0^y f(x,y)dx$

C

$\displaystyle\int_0^1dy\int_y^{2-y}f(x,y)dx$

D

$\displaystyle\int_2^0dy\int_{y^2/2}^{y}f(x,y)dx$