In human, which one among the following, with reference to breathing, is correct

Options :
  1. during inhalation, diaphragm relaxes
  2. during exhalation, thorax cavity expands
  3. during inhalation, intrapleural pressure becomes more negative
  4. all are true
Answer and Explanation :-

Answer: Option 1

Explanation:

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In the depth a light will grow,A silver shine no shadows know, Like wings unfolding in the sky,That circle 'round a gleaming eye,Turning darkness all away,Even depths will know their day,For every shadow has its end,In light!Life will return again!
-Robert Fanney