The Cross Section of a Long Coaxial Cable Is Shown

The cross section of a long coaxial cable is shown in the figure,with radii as given.The linear charge density on the inner conductor is -30 nC/m and the linear charge density on the outer conductor is
-70 nC/m. The inner and outer cylindrical surfaces are respectively denoted by A,B,C,and D,as shown.(ε₀ = 8.85 × 10^-12 C²/N • m²) The radial component of the electric field at a point that 34 mm from the axis is closest to

A) -16,000 N/C.
B) +16,000 N/C.
C) -37,000 N/C.
D) +37,000 N/C.
E) zero