Sentences B and D talk of flowers and flowering plants. Sentence B talks of how land plants existed without flowers for several millions of years. Sentence D talks of when flowering plants appeared. It is clear D follows B. Sentence C speaks of “equally familiar grasses”. So obviously, some other example- in this case, flowering plants- precedes this. Sentences A and C talk of the evolution of grasses. A follows C. So we have the correct order of arrangement as 4) BDCA Correct Answer: BDCA
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