Q: measures an object's tendency to resist change its motion
answer choices:
a) acceleration
b) gravity
c) inertia
d) mass

B. Inertia

Inertia is the internal property of an object which resists to any physical changes to its motion, including changes in it’s speed and direction of an object. Inertia is directly proportional to the mass of the object, such that, greater the mass, higher the inertia of the object.

Hope this helps! :)