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Identify the most and least reactive elements on the basis of the given sequence of reactions.
\[
\begin{array}{l}
\mathrm{P}+\mathrm{QA} \longrightarrow \mathrm{PA}+\mathrm{Q} \\
\mathrm{P}+\mathrm{QB} \longrightarrow \mathrm{PB}+\mathrm{Q} \\
\mathrm{R}+\mathrm{PA} \longrightarrow \mathrm{RA}+\mathrm{P}
\end{array}
\]
a. \( \mathrm{P} \) and \( \mathrm{R} \)
c. \( R \) and \( P \)
b. \( \mathrm{R} \) and \( \mathrm{Q} \)
d. \( \mathrm{P} \) and \( \mathrm{Q} \)
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