Which procedure is following when using the scientific method to solve a problem? Identify something thought to be true and then set out to prove it
Identify a question, make observations, create a hypothesis, and then set up an experiment to test the hypothesis.
Do an experiment and then ask questions about it.
Find something scientists say is true and then ask questions about it.

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

Answer mechanical energy;