A student sets up this electric circuit. The student then realizes that turning off one light turns off all the lights. In order to make it possible for each light to be turned on and off separately, the student should convert the circuit above into a ...

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

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.