Which of these goods are complements?

contact lenses and glasses

milk and cream

coffee and tea

canoe and paddles

The answer is canoe and paddles

Complement goods are the type of goods that goes hand in hand with one another and enhance each other's value.

Beside canoe and paddle, other examples of these goods are Printer and ink, frying pan and cooking spoon, laptop and wireless mouse, etc.

Canoe and paddles, the question is basically asking which of these go together well.