Which of the following statements about the motion of a body is false?
a. It is not possible to travel at a constant speed for 1 minute and have a displacement of zero.
b. It is not possible to travel at a constant velocity for 1 minute and have a displacement that is zero.
c. A body travelling for 1 minute with a changing velocity can have a final displacement of zero.
d. A body travelling with a constant velocity for 1 minute must have a non-zero displacement.