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What will happen when sound is focussed to a particular area?

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What will happen when sound is focussed to a particular area?

(a) Echoes are produced

(b) Sound becomes inaudible

(c) Interference occurs

(d) Frequency of sound becomes high

This question was addressed to me in semester exam.

Question is taken from Reverberation in portion Waves of Engineering Physics I

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The correct choice is (c) Interference occurs

The best I can explain: When sound waves are produced in a hall, it reaches the observer directly as well as after reflections from walls, floors, ceilings etc. Thus when sound is focussed to a particular area it is possible that interference is produced between the waves, which in turn affect the originality of the sound.

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