The first sentence of the paragraph is likely to be either B or D, as A is too general and C starts off with “this link”. Now, sentence D makes references to the “spectacular Perseid meteor shower” and to “the Swift Tuttle”. What is Swift-Tuttle? That is not obvious from sentence D. On the other hand, from sentence B, we can clearly understand that “Swift-Tuttle” refers to a comet. In a paragraph, B is likely to precede D. The link between sentences C and D is clear. Both of these are about the comet being the cause of the meteor shower. It is clear C follows D. This leaves us with sentence A. Now, we see that the sentence order CA is awkward. C makes a reference to Giovanni Schiaparelli and his discovery whereas A explains why we see the meteor shower every year despite the comet taking 133 years to pass by the Earth. The order DA is more natural. D makes a reference to the shower being witnessed “every August” and A explains why this is so. DAC is a logical flow of ideas. As seen earlier, B precedes D. So, the correct order is BDAC. Correct Answer: BDAC
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