The statement that best explains why your body continues to move forward when you trip is:
d. An unbalanced force stops your foot but does not act on the rest of your body.
When you trip, your foot encounters an obstruction that applies a force to it, causing it to stop. However, due to inertia (the tendency of an object to continue in its state of motion), your body continues moving forward since no force has stopped it in the same way.