Water can exist in three states of matter. imagine examining the changes of state from solid to liquid to gas by adding to ice. what would change or not change?

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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

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

Amagnetic field "does not" interact with stationary electric charges. so, a.hope my answer you : )