How many real roots does the equation \(x^2y+16xy+64y=0\) have if \(y < 0?\)

[Gmat_mission]

How many real roots does the equation \(x^2y+16xy+64y=0\) have if \(y < 0?\)

A. 0
B. 1
C. 2
D. 3
E. Infinite

[spoiler]OA=B[/spoiler]

Source: Veritas Prep