Which one of the following is correctly spelled word?

corroboration

The correct answer is Option (3) → corroboration

The correctly spelled word is corroboration.

Option 1: “commentory”: This spelling is incorrect. The correct spelling is commentary.

Option 2: “commision” : This spelling is incorrect. The correct spelling is commission.

Option 4: “catastrophy”:This spelling is incorrect. The correct spelling is catastrophe.