Answer:
The vector sum of all forces acting on an object
Step-by-step explanation:
Net force is the vector sum of all forces acting on an object. Force is a vector quantity. Two forces of equal magnitude when acting on an object in opposite direction will cancel out each other. As a result net force is equal to 0. The word net here shows the total force acting on the object. Hence, the correct option is (c) "The vector sum of all forces acting on an object".