Concept:The correct word order must make the sentence logically and grammatically meaningful.
Explanation:The first blank refers to the action done by archaeologists.
They "discovered" a carriage, so the word should be "unearthed" (B).
The second blank describes the city's fate after the volcanic event.
It should be "buried" (A) to mean covered by ash.
The third blank is part of the fixed phrase "volcanic eruption" (C).
Thus, the correct sequence is B (unearthed), A (buried), C (eruption).
This order is given in option BAC.
Answer:BAC (Option C)