What is one way that nuclear fusion differs from nuclear fission? A. Nuclear fusion requires very high pressures and temperatures.
B. Nuclear fusion occurs spontaneously on Earth.
C. Nuclear fusion is used in power plants to produce electricity.
D. Nuclear fusion is used to power aircraft carriers.

It's have to be 12 or idk

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current