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Direction: Read the given experiment and answer the following questions.

Paper pins are stuck to a metal rod with wax and a lighted candle is kept below the rod as shown in the diagram below.

What does this experiment illustrate?

A) Wax melts easily.

B) The candle flame conducts heat.   

C) The thumbtacks expand when heated.

D) Heat gets transferred from hot part of a body to cold part.