The displacement method for measuring volume:
( it has more that one answer fyi)

a- is not always accurate
b- can only be used to measure the volume of solids
c- may yield incorrect results if the matter is soluble in liquid
d- is the most precise way to measure the volume of a gas

Explanation:

It is known that to measure the volume of regular or irregular solids we can put the solid into a liquid. And then, the volume of liquid displaced will be equal to the volume of irregular solid.

Also, we can measure the volume of a gas with the help of displacement.

For example, in a syringe the volume of gas displaced will be equal to the volume occupied by the fluid.

If a matter is soluble in liquid, then we cannot measure its correct volume.

Therefore, we can conclude that the displacement method for measuring volume: