Ampere's Law: a Hollow Cylinder with an Inner Radius of

Ampere's law: A hollow cylinder with an inner radius of and an outer radius of conducts a 3.0-A current flowing parallel to the axis of the cylinder. If the current density is uniform throughout the wire, what is the magnitude of the magnetic field at a point from its center? (μ₀ = 4π × 10^-7 T ∙ m/A)

A) 7.2 × 10^-6 T
B) 8.0 × 10^-6 T
C) 8.9 × 10^-7 T
D) 7.1 × 10^-8 T