Answer:
b
Step-by-step explanation:
As we know that
Average velocity= Total displacement/Total time
v=d/t
Average speed= Total distance/Total time
V=S/T
As we know that average acceleration given as

Starting and finishing point is same for race,that means that it total displacement will be zero but total distance will not be zero.So we cam say that it average velocity will be zero but average speed will not be zero.It average acceleration will not be zero also.
So our option b is correct.