The $E^{0}_{Red}$ values for $P, Q, R$ and $S$ are $-2.90 \, V, +0.34 \, V, +1.20 \, V$ and $-0.76 \, V$ respectively. The decreasing order of their reactivity is:
- A$P > Q > R > S$
- B$Q > P > R > S$
- C$R > Q > S > P$
- D$P > S > Q > R$
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