Question: One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which best describes what is happening during this investigation?

  Options: 
 A. Convection carries heat to the thermometer.
 B. Radiant energy warms the thermometer.
 C. Mechanical energy from the flame carries heat to the thermometer.
 D. Heat from the flame is conducted through the metal rod to the thermometer.
Answer: D