Which of the following examples illustrates a scenario where the distance covered by a moving body is equal to its magnitude of displacement?
a) A car travels 10 km north, then 5 km south, and finally 5 km north again.
b) A person walks around a circular track with a circumference of 1 km.
c) A ball is thrown upwards and lands back at the same position.
d) A cyclist rides straight along a road for 8 km and then returns back along the same path.
