500
Rebecca performs 2 investigations, A and B, to study how temperature affects humidity. In Investigation A, Rebecca records temperature and humidity information from weather charts of different geographical areas in her notebook. In Investigation B, she measures the humidity in a large container at different temperatures in the laboratory. She records the temperature and resulting humidity levels in her notebook. Which statement best explains whether the investigations were controlled experiments?
B) Investigation B was a controlled experiment since other factors were kept constant.