Answer:
Both
Explanation:
Both are technically correct. Kevin is correct in the sense that there is no sound in space, however he is incorrect because there are some waves (Electromagnetic waves) that do not need a medium (matter) to travel through. Camilla is correct in the sense that there are some waves that need a medium to travel through (Mechanical Waves) but not all do (Electromagnetic Waves). If the question is about if sound needs a medium to travel through, Kevin is correct. If the question is about if some waves do not need a medium to travel through, Camilla is correct.