Final answer:
The independent variable in this question is the type of sneakers worn by football players. The Adidas company wants to investigate if football players can run faster if they wear Adidas sneakers.
Step-by-step explanation:
The independent variable in this question is B) The type of sneakers worn by football players. The Adidas company wants to investigate if football players can run faster if they wear Adidas sneakers. To test this, they would select a group of football players and have them run in different types of sneakers, including Adidas and other brands. They would then measure the running speed of the players wearing different types of sneakers and compare the results to see if there is a difference in speed.