Final answer:
The statement is true; it accurately describes Newton's second law of motion, which relates acceleration to net force and mass.
The correct option is a.
Step-by-step explanation:
The statement that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass is true. This is a concise description of Newtons second law of motion, which can be expressed in equation form as a = Fnet/m, where a is the acceleration,
Fnet is the net external force, and m is the mass of the object. According to this law, when the net external force on an object doubles, the acceleration doubles, assuming the mass remains constant. Conversely, if the mass of an object doubles while the net force remains the same, the acceleration is reduced by half.
The correct option is a.