Fill in the Blanks: Archaeologists believe that the pieces of red-ware pottery excavated recently near Bhavnagar and ______ shed light on a hitherto dark 600-year period in the Harappan history of Gujarat.
Option b) is wrong because because of the use of the word "are". Option c) is wrong because it implies that the pieces are "3400 years old with reasonable certainity". Option a) is incorrect because of the use fo the phrase "as being about". Option d) is grammatically correct.
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