If a Beaker of Water Is Placed Under a Broiler

Multiple Choice

If a beaker of water is placed under a broiler so that the heating coil is above the beaker.It is observed that only the surface layer boils.The water at the bottom of the beaker remains close to the initial temperature of the water.Which of the following statements is the most reasonable conclusion to be drawn from these observations?

A) Water is a poor conductor of heat.
B) The sample must contain impurities.
C) Water is easily heated by radiation.
D) Water exhibits anomalous thermal behavior.
E) The molecular motion in the sample is not random.