Correct Answer: Undeciphered

Solution : The correct answer is Undeciphered .

We are still unable to decipher the script of the Indus Valley Civilisation. The Indus script is riddled with too much uncertainty. The "script", though not yet fully interpreted, is still being worked on despite numerous attempts. There are just too many signs in the script between 375 and 400 indicating that it was not alphabetical, even though the script's meaning is still unknown.