Final answer:
The sprint performance in the 1968 Olympics in Mexico City showed dramatic improvements compared to the 1964 Olympics in Tokyo due to b. altitude effects.
Step-by-step explanation:
The sprint performance in track & field showed dramatic improvements in the 1968 Olympics held in Mexico City, compared to the 1964 Olympics held in Tokyo, Japan due to b. altitude effects.
Mexico City is located at a high altitude, which has less oxygen in the air. This can make it more difficult for athletes to perform at their best, especially in endurance events.
However, in sprinting events, the reduced air resistance at higher altitudes can actually benefit athletes, allowing them to achieve faster times. The altitude effect, therefore, played a significant role in the improved sprint performances seen in Mexico City.