C - the temperature at a football game and the amount of drinks sold.
explanation
a child’s shoe size is not determined by age, but by genetics. yes children’s feet grow larger as they age, but the shoe size is not CAUSED by the age.
the amount of ice cream and sunscreen sold has no causation.
the temp at a football game and the amount of drinks sold is an example of a causal relationship. the amount of drinks sold is determined or caused by the temperature outside. more people will buy hot drinks if it is cold outside but if it’s not cold outside less people will buy hot drinks.
the number of people attending a ball game does not determine the length of the game.