Given here are four sentences. The first sentence is in correct order while the rest of the sentences are jumbled. Pick the option that gives their correct order.
A. Environmental engineers are always trying to find solutions to the problem of pollution.
B. They also have to deal with medical waste and radioactive leakages.
C. The pollution caused by chemicals, oil spills, hazardous and toxic waste is especially dangerous.
D. We can help them by avoiding such pollutants and by segregating waste for easy processing.

Correct option is D

Option (d) ADBC is the correct order of the given sentences.
Let’s examine the logical and thematic flow of the paragraph step-by-step:
Step 1: Starting Point – A
· Sentence A introduces the topic of environmental engineers and their mission: solving pollution-related issues.
· This is a general opening sentence, establishing the central idea.
Step 2: Add Detail – B
· Sentence B gives more information about specific issues these engineers deal with — medical waste and radioactive leaks.
· It naturally follows the general statement in A.
Step 3: Elaborate Further – C
· Sentence C adds further examples of harmful pollutants like chemicals and oil spills.
· This continues the explanation of the kinds of pollution from sentence B.
Step 4: Conclusion and Solution – D
· Sentence D shifts the focus to what "we" (the general public) can do to support the engineers — i.e., public responsibility and action.
· It works as a concluding or solution-oriented statement.
✔️ Logical Order:
A → B → C → D
→ Introduce the engineers → Talk about pollution types → Elaborate on dangerous pollutants → Suggest public action.