Two Long Parallel Wires That Are 0 $\vec { B }$

Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions.What is the magnitude of the $\vec { B }$ field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (μ₀ = 4π × 10^-7 T ∙ m/A)

A) 3.3 µT
B) 6.7 µT
C) 33 µT
D) 67 µT