When two parallel wires carry currents in opposite directions, the force on either wire is
away from the other wire
zero, because the currents cancel each other
twice as much as when the currents are in the same direction
towards the other wire
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When two parallel wires carry currents in opposite directions, the force between the wires is repulsive. This is due to the interaction of the magnetic fields produced by the currents. If the currents were flowing in the same direction, the force would be attractive, but in opposite directions, they repel each other.
I understand why you might think that A is the answer, but when two parallel wires carry currents in opposite directions, the force on either wire is actually towards the other wire. This is due to the magnetic fields created by the currents interacting with each other.
If two parallel wires carry current in opposite directions, they repel each other whereas if two parallel wires carry current in same direction, they attract each other.
The two magnetic fields created by it will also be opposite to each other, so they will repel.
