Rearrange the phrases to form a meaningful sentence:-

(A) in the region

(B) had percolated into the underground water

(C) thus, causing a water crisis

(D) the pollutants from the factory

Choose the correct answer from the options given below:-

The correct option is (D), (B), (C), (A).

To form a grammatically correct and meaningful sentence, we need to arrange the given phrases in a logical sequence. Let's analyze the role of each phrase:
- (D) the pollutants from the factory: This phrase acts as the subject of the sentence, indicating what the sentence is about.
- (B) had percolated into the underground water: This phrase contains the main verb ("had percolated") and describes the action performed by the subject (the pollutants). Therefore, it should immediately follow the subject (D). This gives us the flow: "the pollutants from the factory had percolated into the underground water".
- (C) thus, causing a water crisis: This phrase describes the consequence or result of the action described in phrase (B). The word "thus" indicates a logical transition showing the effect of the percolation. Hence, it follows (B).
- (A) in the region: This prepositional phrase specifies the location where the water crisis occurred, modifying "a water crisis" in phrase (C). Thus, it naturally completes the sentence.

Combining these phrases in the order (D) → (B) → (C) → (A) yields the complete, coherent sentence:
"The pollutants from the factory had percolated into the underground water, thus, causing a water crisis in the region."