Final answer:
The correct relationship is that pressure is equal to resistance multiplied by flow, which is represented by the formula Pressure = Resistance × Flow.
Step-by-step explanation:
The correct relationship among pressure, flow, and resistance is represented by the formula ΔP = RQ, which can be rephrased as Pressure = Resistance × Flow. This means that the pressure difference across a pipe (ΔP) is equal to the resistance (R) of the pipe multiplied by the flow rate (Q) through it. Another way to look at this relationship is that the flow rate (Q) is directly proportional to the pressure difference and inversely proportional to the resistance, which can be stated as Q = ΔP/R. Therefore, the correct option is D) Pressure = Resistance × Flow.