Question:

Rearrange the following phrases into a meaningful sentence: The need for a scientific understanding ______.
(A) the Rio Earth Summit, the first of its kind
(B) involving world leaders on environment and development
(C) of natural ecosystems including forests was the main objective of
(D) of phenomena like climate change, biodiversity, and conservation

Show Hint

Always look for prepositions. "Understanding" is almost always followed by "of." Since both (D) and (C) start with "of," check which one flows better from the word "understanding."
Updated On: May 15, 2026
  • (C), (D), (A), (B)
  • (B), (C), (D), (A)
  • (D), (C), (A), (B)
  • (D), (B), (A), (C)
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The Correct Option is C

Solution and Explanation


Step 1: Understanding the Concept:

To solve this, we must link the preposition "of" following "understanding" to its objects, and then find the verb that completes the main clause.

Step 2: Detailed Explanation:

1. The subject starts with: "The need for a scientific understanding..." 2. Understanding of what? (D) "...of phenomena like climate change, biodiversity, and conservation" 3. Continuing the object list: (C) "...of natural ecosystems including forests was the main objective of" 4. Objective of what event? (A) "...the Rio Earth Summit, the first of its kind" 5. Describing the summit: (B) "...involving world leaders on environment and development."

Step 3: Final Answer:

The full sentence is: "The need for a scientific understanding of phenomena like climate change, biodiversity, and conservation of natural ecosystems including forests was the main objective of the Rio Earth Summit, the first of its kind involving world leaders on environment and development." The correct sequence is (D), (C), (A), (B).
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