5253. 1 : Charles Goodyear once accidentally P : and found that the resulting rubber Q : dropped a mixture of natural rubber R : was harder, stronger, more elastic S : and sulphur over a hot stove 6 : and non-sticky The Proper sequence should be:

A. PSQR
B. QSPR
C. RSQP
D. SQPR
✅ The correct answer is option B.

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