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Explanation:

(c) EDACB is the correct answer choice.
DA is a mandatory pair, as ‘in the early 1990s’ in D links chronologically with ‘since then’ in A links chronologically with ‘in the early 1900s’ in D.
Furthermore, D refers to ‘such tests’ and, therefore cannot start the paragraph.
CB also emerges as a closely-linked pair. ‘In other words’ in B summarizes succinctly the idea introduced in C.
Other options do not meet all the above requirements and hence do not flow logically from start to finish.

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