One plastic cup is inserted inside another. A small spacer holds the two cups apart. Hot water is then poured into the inner cup, and a lid is placed over the top, as shown. Which statement is correct?
- AThe bench is heated by convection from the bottom of the outer cup.
- BThe lid reduces the energy lost by convection.
- CThere is no thermal conduction through the sides of either cup.
- DThermal radiation is prevented by the small air gap.