Match the catalyst with the product that it helps to produce
i.                           P.
ii. Fe Q.CO
iii. Pt-Rh                       R. 
iv. Ni                             S. 
i-R, ii-S, iii-P, iv-Q
i-Q, ii-S, iii-P, iv-R
i-S, ii-R, iii-P, iv-Q
i-R, ii-P, iii-S, iv-Q
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