What is the structural difference between plant and animal cells in terms of energy productio?

Most of the energy production in a plant cell happens by "Chloroplasts" through the process of photosynthesis whereas in animal cells, "Mitochondria" does that through the process of Cellular respiration

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Dis the

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