Why of these goods are complements coffee and tea canoe and paddles contact lenses and glasses milk and cream?

Coffee and tea are considered complements because they are often consumed together or used interchangeably as beverages, appealing to similar consumer preferences. Canoes and paddles are also complements, as a paddle is essential for propelling a canoe, making them functionally connected. In contrast, contact lenses and glasses serve the same purpose of vision correction, but they are substitutes rather than complements. Milk and cream can be seen as complements since cream is often added to coffee or used in recipes that include milk.