Rearrange the following parts in the correct sequence to form a meaningful sentence:-

(A) upon them unveiling a long-lost civilization
(B) forest remained a mystery for centuries
(C) the ancient ruins, hidden deep within the
(D) until an archaeologist accidentally stumbled

Choose the correct answer from the options given below:-

(C), (B), (D), (A)

The correct answer is Option (4) → (C), (B), (D), (A)

(C) the ancient ruins, hidden deep within the
(B) forest remained a mystery for centuries
(D) until an archaeologist accidentally stumbled
(A) upon them unveiling a long-lost civilization

Rearranged sentence: The ancient ruins, hidden deep within the forest remained a mystery for centuries until an archaeologist accidentally stumbled upon them unveiling a long-lost civilization.