Because the ______ leading to flight cancellation were murky, the Minister appointed a Commission to ______ and report the matter.

Because the leading to flight cancellation were murky, the Minister appointed a Commission to and report the matter.

Decision ...... Decide

Facts ...... Underplay

Circumstances ...... Investigate

None of these

"Circumstances" fits the context, as it refers to the factors or conditions leading to flight cancellation.

"Investigate" makes sense as the action the Minister would take to look into the matter.