The outline of principal event of urination is given below in unordered manner
I. Stretch receptors on the wall of urinary bladder send signal to the CNS
II. The bladder fills with urine and becomes distended
III. Micturition
IV. CNS passes on motor messages to initiate the contraction of smooth muscles of bladder and simultaneous relaxation of urethral sphincter.
The correct order of steps for urination is-

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IV → III → II → I

I → II → III → IV

III → II → I → IV

II → I → IV → III

answer is C.

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Detailed Solution

The urinary bladder fills with urine & becomes distended.
   $↓$
Stretch receptors on the wall of urinary bladder send signal to CNS.
   $↓$
CNS passes motor message to initiate contraction of smooth muscles of bladder and simultaneously relaxation of sphincter muscle.
   $↓$
Release of urine [micturition].

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