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A quotient means division, so you can get rid of the third and fourth choices. It says "opposite" so that means negative. The answer is the second choice: 
Answer:
The mass of a substance that passes per unit of time is called the mass flow rate, the unit of mass flow rate is kilogram per second in SI units.
Step-by-step explanation:
Consider the provided information.
We need to Define mass and volume flow rates and how they are related.
The mass of a substance that passes per unit of time is called the mass flow rate, the unit of mass flow rate is kilogram per second in SI units.
The volume of fluid which passes per unit time is called volume flow rate.
The relation between them is:
The Mass flow rate = Density × Volume flow rate
Or
Where ρ is the density.