Consider the substance represented by the heating curve. what is the most accurate conclusion can you draw about the vaporization of the substance?
a) heat of fusion equals heat of vaporization.
b) the melting point is half the boiling point.
c) it takes the substance longer to vaporize than it does to condense.
d) it requires much more energy to vaporize the substance than to melt it

The answer is D. it requires much more energy

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

Your answer is 120miles