How does the molecular motion of a substance change when it goes from liquid to gas? A
The molecules lose energy and their relative motion increases.
The molecules gain energy and their relative motion increases.
с
The molecules lose energy and their relative motion decreases.
D
The molecules gain energy and their relative motion decreases.

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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