Final answer:
The best example of a linear boundary in daily life is the path traced by a car moving at a constant speed in a straight line.
Step-by-step explanation:
The best example of a linear boundary in daily life is c) The path traced by a car moving at a constant speed in a straight line. This is because a linear boundary represents a straight line, and the path traced by a car moving at a constant speed in a straight line follows a linear boundary. For example, when a car is driving on a straight road without making any turns or deviations, it is moving along a linear boundary.