A Gaseous Reaction Occurs by a Two-Step Mechanism,shown Below

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast}
Step 2: AXY₂ + AX → 2 AXY slow
Including concentration of only reactants and products,what is the rate law for this reaction?

A) Rate = k[AX][XY₂]
B) Rate = k[AXY₂]/[AX][Y₂]
C) Rate = k[AX]²[Y₂]
D) Rate = k[AXY]²/[A Y₂][AX]