How are the interactions between white light and an opaque object and between suhlight and Earth's atmosphere alike?
How are they different

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

Wut 

Um idk im just doing this for points so just ask google or something

From movment law u have this case where: distance d is : d = v*t; v =  velocity; t = time; from here u can extract the time.