Charlie hears an advertisement for Cremefresh lotion. The advertisement says that Cremefresh lotion heals dry skin 75% faster than other leading lotion brands. How can Charlie use scientific thinking to find out if the lotion company's claims are true?

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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