echolocation is a form of sensory perception used by animal such as bats tooted whales and dolphins . the animal emits and a pulse of sound (longitudinal wave) which after reflection from objects returns and is detectd by the animal echolocation waves can have frequencies of about 100,000 Hz. (A) estimate the wave length of a sea animal echolocation waves. (B) if an obstacle is 100m from the animal. how long after the animal emits a wave is its reflection defeated​

This is the answer of your question

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

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