If a Slope Field For $\frac { d y } { d x }$

Multiple Choice

If a slope field for $\frac { d y } { d x }$ has constant slopes where y is constant, what do you know about $\frac { d y } { d x }$ ?

A) $\frac { d y } { d x }$ depends on y only.
B) $\frac { d y } { d x }$ depends on x only.
C) $\frac { d y } { d x }$ must be linear in y.
D) $\frac { d y } { d x }$ must be linear in x.