The correct answer is C. 981.
A dyne is a unit of force in the CGS system of units. It is defined as the force required to accelerate a mass of one gram at a rate of one centimeter per second squared.
One gram of weight is the force exerted by gravity on a mass of one gram. The acceleration due to gravity on Earth is approximately 9.81 meters per second squared.
Option A is incorrect because 250 dynes is less than the force of gravity on one gram of mass.
Option B is incorrect because 375 dynes is also less than the force of gravity on one gram of mass.
Option D is incorrect because 900 dynes is greater than the force of gravity on one gram of mass.