Direction: In the following passage, some of the words have been left out. Read the passage carefully and choose the answer for the given blank out of the four alternatives.

After an accident at Rajasthan's Mahajan field firing range on 2 February 2019, due to ______ (1) ______ in the ammunition of L-70 air defence guns, a meeting was called by senior Indian Army officials. Two officers from the manufacturer, the Ordnance Factory Board (OFB), were invited to discuss the reasons for the accident. Both failed to turn ______ (2) ______ for the meeting on 14 February, which ______ (3) ______ serious discussion within the defence establishment about the lackadaisical approach of OFB in resolving the quality concerns of armed forces.