Professor whitney has a sample of lead and a sample of iron. the samples have equal mass. when whitney heats the samples, the lead reaches a higher temperature than the iron, even though both samples absorbed the same amount of thermal energy. what can whitney conclude from this experiment? a. iron is a better conductor of heat than lead. b. lead is a better conductor of heat than iron. c. lead has a higher heat capacity than iron. d. iron has a higher heat capacity than lead.