The equation $x ^ { 3 } y + x y ^ { 3 } + x y = 0$ represents
(A) a circle
(B) a circle and a pair of straight lines
(C) a rectangular hyperbola
(D) a pair of straight lines
The equation $x ^ { 3 } y + x y ^ { 3 } + x y = 0$ represents\\
(A) a circle\\
(B) a circle and a pair of straight lines\\
(C) a rectangular hyperbola\\
(D) a pair of straight lines