Which of the following describes a heat sink? a. a device that converts work into heatb. a device that inputs heat into a cool objectc. a device that absorbs and draws heat from a hot object, dispersing it into the surroundingsd. a device that converts heat into work

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