Boyle's Law for Enclosed Gases States That at a Constant

Boyle's law for enclosed gases states that at a constant temperature, the pressure is related to the volume by the equation , where k is a constant. If the volume is increasing at a rate of 8 cubic inches per hour, at what rate is the pressure changing when the volume is 40 cubic inches and inch-pounds?

A) 0.003 lb/in²/hr
B) -0.003 lb/in²/hr
C) -12.800 lb/in²/hr
D) 1.000 lb/in²/hr
E) -0.025 lb/in²/hr