Sentence A talks of the ‘punch’ delivered by sprinters when they drive the foot into the track. That is, sprinters strike the ground with great force as they run. We see that sentence C, too, ties in with this idea. A follows C, as it explains how the ‘force’ mentioned in C is generated. Now, looking at sentences B and D, we see that they are at odds with each other. Sentence B declares that the swiftest runners achieve top speed by swinging their legs faster while they reposition their limbs in air. Sentence D, on the other hand, states that all runners take roughly the same time when airborne to reposition their legs for the next stride. Only one of these can be true. The primary idea in sentences A and C is that the speed of a sprinter is determined by the force and speed with which he strikes the ground. Neither of these makes a reference to the time taken to swing the leg or reposition it in the air. Also note that sentence C begins with ‘what faster runners do better…’. The sentence that links to this is not likely to attribute the reason sprinters achieve top speed to some other factor other than the force with which they strike the ground. So, the sentence that does not fit in is sentence B, as it ties a sprinter’s speed to his speed of repositioning his legs while airborne. DCA makes a cogent paragraph. Correct Answer: Choice (B)
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