Question

You are on a field trip and are recording the amount of mass in a volume of water. What are you measuring?

Answer 1

The correct option is "D", "The density of seawater".
As you are measuring the amount of mass in a volume of water and if we look at the definition of density, it is the mass per unit volume.
D = m/v
where m is the mass of an object and v is the volume.
Thus, d is the correct option.