Two horizontal wires with identical in magnitude currents carry currents: left wire directly towards you, right wire away from you. As viewed from your position, magnetic field exactly midway between wires is:

before we can answer, we have to see the choices that are printed there with the question.   that's the only way we can point you to the correct one.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.