Correct option is A
Option
(a) is the correct order of the given sentences.
Explanation (why 4-3-1-2 is correct):
·
(4) Introduces the subject and event (discovery of the Rosetta Stone in 1799) — a natural starting point.
·
(3) Uses
“It” to refer back to the Rosetta Stone and adds key detail (the three scripts), creating cohesion via pronoun reference.
·
(1) States the significance: the artifact became the
key to decipherment — logical consequence of (3).
·
(2) Gives the climactic outcome and agent (Champollion’s breakthrough), completing the causal chain and providing historical impact.