In a catalytic reaction N₂+3H₂→2NH₃ ( all in gaseous state ).

rate =Δ[NH₃]/Δt=4.0×10⁻⁴×10⁻⁴mo≤L⁻¹S⁻¹

The rate of reaction when expressed in terms of changes in concentration of (i) N₂ (ii) H₂ are respectively ___.
A. 2×10⁻⁴ , 6×10⁻⁴
B. 1×10⁻⁴ , 3×10⁻⁴
C. 2×10⁴ ,3×10⁻⁴
D. 4×10⁻⁴ , 3×10⁻⁴