Water is in a beaker at a temperature of 5 °C. An iron rod at a temperature of 30 °C is then placed in the water. Which statement best explains the heat transfer between the iron and water? A. Heat flows from water to iron until the temperatures of both become equal. B. Heat flows from iron to water until the temperatures of both become equal. C. Heat flows from water to iron, and it continues to flow even after the temperatures of both become equal. D. Heat flows from iron to water, and it continues to flow even after the temperatures of both become equal.