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?

Given;
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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