Answer:
The force exerted on a given area.
Option B is the right option.
Step-by-step explanation:
About pressure
Pressure is defined as force acting per unit area. It's SI unit is Pascal or N/m^2.
Formula to find pressure is:

The force acting perpendicular on a surface is called the thrust. It is a vector quantity.
One Pascal pressure
One Pascal pressure is defined as the pressure exerted in a surface of area m^2 by the thrust of 1 N
Hope this helps ..
Good luck on your assignment.....