The correct answer is B. Pressure.
Pascal (Pa) is the SI unit of pressure. It is defined as one newton per square meter (N/m2). Pressure is a fundamental quantity in physics and engineering, and it is used to describe the force exerted by a fluid on a surface.
Thrust is a force that pushes an object forward. It is often used in the context of rockets and other projectiles. Thrust is measured in newtons (N).
Frequency is the number of cycles of a wave that occur in a given amount of time. It is measured in hertz (Hz).
Conductivity is a measure of how easily an electric current can flow through a material. It is measured in siemens per meter (S/m).
In conclusion, Pa(Pascal) is the unit for pressure.