Explanation:

- Thrust is a force exerted by a liquid on a surface. It is typically measured in newtons.

- Pressure is defined as the force (thrust) per unit area. It is measured in pascals (Pa).

- To calculate pressure, you divide the thrust by the area over which it acts.

- Option 1: Area – Thrust divided by area gives you pressure. This is the correct answer.

- Option 2: Density – Density is mass per unit volume. It does not directly relate to thrust or pressure.

- Option 3: Mass – Mass is the amount of matter in an object and is unrelated to pressure calculation from thrust.

- Option 4: Volume – Volume is the space an object occupies; it does not directly relate to pressure from thrust.