Final answer:
Racer 3 is ahead of Racer 1 at t = T/2.
Step-by-step explanation:
In this scenario, all the racers start at the same time and location. The initial velocity of Racer 3 is zero, meaning Racer 3 starts from rest.
Based on this information, we can conclude that statement c is true: Racer 3 is ahead of Racer 1 at t = T/2. Since Racer 3 starts from rest while Racer 1 is already moving, Racer 3 will have covered less distance by the halfway point of the race, making Racer 3 ahead of Racer 1.
Therefore, the correct answer is c.