Ricky, mass 95 kg, and cathy, who is lighter, are enjoying lake mendota at dusk in a 20 kg canoe that is 3.0 m long. when the canoe is at rest in placid water, they exchange seats, which are at the ends of the canoe. ricky notices the canoe moved 30 cm relative to a submerged rock during the exchange and uses that to calculate cathy’s mass. what is cathy’s mass?

It's have to be 12 or idk

Fitness is the ability to perform only very light levels of physical activity.

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