What is the term for the percentage of light reflected by somthing?

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained

Sorry i don’t know what to do

Ibelieve that the correct answer is: c. along plate boundaries

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