You and your father were about to enter one of the 5 star hotel of Delhi, suddenly you heard an intense…

The correct choice is: Start locating the source of noise.

‘Start locating the source of noise.’ is the best answer. In an emergency you must stay calm and alert: knowing where the blast came from tells you which way is safe to move and what to report to security or the police.

‘Start screaming for help…’ spreads panic, ‘Start praying while controlling your anger.’ does nothing about the danger, and holding your father and chatting does not assess the situation or move you both to safety.