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Option 1: Lord Wooley - This is not the correct answer. Lord Wooley was a British archaeologist known for his work in the ancient Near East.
Option 2: Daya Ram Sahni - This is the correct answer. Daya Ram Sahni was an Indian archaeologist who discovered the Harappan civilization (also known as the Indus Valley Civilization) in 1921.
Option 3: V. S. Agarwal - This is not the correct answer. V. S. Agarwal is a renowned Indian archaeologist, but he is not one of the discoverers of the Indus Valley Civilization.
Option 4: A. L. Basham - This is not the correct answer. A. L. Basham was a British historian and Indologist, but he did not discover the Indus Valley Civilization.
In conclusion, Daya Ram Sahni was one of the discoverers of the Indus Valley Civilization, making option 2 the correct answer.