Suppose the Relationship Between the Price P, of a Product $\frac { d p } { d s } = - \frac { 1 } { 10 } ( s + 3 )$

Suppose the relationship between the price p, of a product and the weekly sales, s, of the product is given by the differential equation $\frac { d p } { d s } = - \frac { 1 } { 10 } ( s + 3 )$ Then

A) as sales increase, the price increases.
B) as the price increases the rate of change of the price also increases.
C) the rate of the decrease of the price is proportional to the sales.
D) s = 0 is a constant solution to this differential equation.
E) all of these