I just came here to ask about the same question. I feel like the question could be asked better. In a way, you need to know both in order to calculate voltage drops. However, I feel like the answer should be circuit current because that is what you use in the formula to calculate the voltage drop. You use total resistance to figure the circuit current not the voltage drop.
Just a thought, I still passed with a 90% so no biggie, just seems like a trick in a way.