Rearrange the following sentences to form a meaningful passage:
1. Scientists had long theorized the existence of gravitational waves. 2. Their detection confirmed a major prediction of Einstein's theory. 3. They were eventually observed by LIGO in 2015. 4. The event opened new avenues in astrophysics.
Show answer & explanation
Correct answer: A
Explanation
We must identify the chronological and logical progression.
Step 1: First comes theory.
Scientists theorized gravitational waves.
Sentence 1 begins the passage.
Step 2: Then comes observation.
They were eventually observed by LIGO in 2015.
Sentence 3 logically follows.
Step 3: Detection confirmed Einstein’s prediction.
Sentence 2 explains the significance of the observation.
Step 4: Finally, the broader impact is stated.
The event opened new avenues in astrophysics.
Sentence 4 concludes the passage.
Thus, the correct order is:
1 → 3 → 2 → 4
Therefore, the correct answer is 1-3-2-4.
Logical Structure Type: Theory → Discovery → Confirmation → Impact.