Question

Three years ago a group of (1) scientists made a breathtaking (2) breakthrough discovery (3) by publishing a genetic map showing the DNA breakdown of the human race (4).

Directions : In the following sentence, four words are emboldened. They are marked as 1, 2, 3 and 4. Out of these, one word is redundant. Choose the word that I redundant as the answer. If all the words are correct, mark option 5, “No error” as your answer.
A 1
B 2
C 3
D 4
E No error
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