Which of the given options is the most logical sequencing of the following sentences to form a meaningful paragraph? 1. In 2019, the Event Horizon Telescope captured the first-ever image of a black hole's event horizon. 2. He theorized that black holes, with their immense gravitational pull, create the most extreme form of this curvature. 3. This observation matched Einstein's predictions, confirming that space-time warps in the precise way described by Einstein. 4. Einstein's predicted about space-time curvature in his General Theory of Relativity.
4-2-1-3
Sentence 4 opens the paragraph: it introduces Einstein and his prediction about space-time curvature in the General Theory of Relativity. It must come first because sentence 2 uses 'He' and 'this curvature', which need Einstein and curvature to have been mentioned already.
Sentence 2 follows 4: 'He' refers to Einstein, and it extends his idea to black holes, which create the most extreme form of 'this curvature'.
Sentence 1 comes next: it moves from theory to evidence, describing how the Event Horizon Telescope captured the first-ever image of a black hole's event horizon in 2019.
Sentence 3 closes the paragraph: 'This observation' refers to the 2019 image of sentence 1, and it concludes that the observation matched Einstein's predictions about space-time.
The paragraph thus moves from the prediction (4) to its application to black holes (2), the observation (1) and the confirmation (3).
Hence, the most logical sequence is 4-2-1-3.
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