The correct option is Acceleration due to gravity : $m s^{-2}$
Explanation
Physical quantities are measured using standard units defined by the International System of Units (SI). These units are classified into base units (e.g., kilogram for mass) and derived units (e.g., Newton for force, which is derived from mass, length, and time).
Option-wise Analysis
- Option (a) is Incorrect: The SI unit of Mass is the kilogram (kg). The unit given, kg m s⁻², represents Force (Newton), defined as mass times acceleration ($F = ma$).
- Option (b) is Incorrect: Weight is the force with which a body is attracted towards the earth. Its SI unit is the Newton (N) or kg m s⁻². The unit given, N m⁻² (Newton per square meter), represents Pressure or Stress (Pascal).
- Option (c) is Correct: Acceleration due to gravity ($g$) is the acceleration gained by an object due to gravitational force. Its SI unit is meters per second squared ($m s^{-2}$), which is the same as any other form of acceleration.
- Option (d) is Incorrect: Thrust is the total force acting perpendicular to a surface. Since it is a force, its SI unit is the Newton (N) or kg m s⁻². The unit given, kg m⁻¹ s⁻², corresponds to Pressure ($Force/Area$).
Key Takeaway: Acceleration due to gravity is a form of acceleration with the unit $m s^{-2}$. Weight and Thrust are forces with the unit Newton (N), while Mass is a base quantity with the unit kilogram (kg).