Heating thinks up

Which of the circuits shown below will produce the most heat, while not exceeding the ratings given for any of the components in the circuit?

All of the resistors are 33 ohm 0.5 watt rating.
The power supply is 12 volt DC 0.5 amp rating.

A; Schematic A
B; Schematic B
C; Schematic C
D; Schematic D
E; Schematic E
F; They all produce the same amount of heat.
G; They all exceeded at least one of the limits set by the ratings of the individual components.


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