For the Reaction S₂O₈2^-(aq) + 3I^-(aq) $\rightarrow$ 2SO₄2^-(aq)+ I₃-(Aq),
Rate =K[S₂O₈2^-][I^-]

For the reaction S₂O₈2^-(aq) + 3I^-(aq) $\rightarrow$ 2SO₄2^-(aq) + I₃-(aq) ,
Rate =k[S₂O₈2^-][I^-].When the reaction is followed under pseudo-first-order conditions with [S₂O₈2^-] = 200 m M and [I^-] = 1.5 m M,
The rate constant was 1.82 s^-1.The second order rate constant,K,For the reaction is

A) 1.21 * 10³ M^-1.s^-1.
B) 6.07 * 10³ M^-1.s^-1.
C) 9.10 M^-1.s^-1.
D) 1.37 * 10^-2 M^-1.s^-1.
E) 1.82 M^-1.s^-1..