A customer purchases 5M of New York 3% G. O.'s, maturing in 2042 at 90. The interest payment dates are Jan 1st and Jul 1st. The trade took place on Tuesday, Feb 1st. How much will the customer pay for the bonds, excluding commissions and accrued interest?

Scientific classification

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