Calculate kp for the reaction 2nocl(g) = 2no(g) cl2(g) at 400°c if kc at 400°c for this reaction is 2.1 × 10⁻².

A. 1.05x10⁻²
B. 2.1x10⁻²
C. 4.2x10⁻²
D. 8.4x10⁻³