Sulfur Trioxide Can Undergo Decomposition According to the Equation 2SO₃

Sulfur trioxide can undergo decomposition according to the equation 2SO₃ → 2SO₂ + O₂
For this reaction, rate = -0.5Δ[SO₃ ]/Δt = k[SO₃]². If the reaction rate is 1.75 × 10^-7 mol L^-1 min^-1 when the concentration of sulfur trioxide is 5.4 × 10^-3 mol L^-1, what is the value of the rate constant k?

A) 3.2 × 10^-5 L mol^-1 min^-1
B) 1.6 × 10^-5 L mol^-1 min^-1
C) 6.0 × 10^-3 L mol^-1 min^-1
D) 3.0 × 10^-3 L mol^-1 min^-1
E) 1.6 × 10^-2 L mol^-1 min^-1