In which scenario is the experimental probability equal to the theoretical probability?

a A coin is flipped six times and the head appears five times.
b A coin is flipped six times and the head appears four times.
c A coin is flipped six times and the head appears each time.
d A coin is flipped six times and the head appears three times.

c A coin is flipped six times and the head appears each time. In this scenario, the experimental probability (the observed frequency of heads) is 1, which is equal to the theoretical probability, since the coin has a 50% chance of landing heads on each flip.