It is a characteristic of a haiku.
a. it analyzes the personal life of the poet.
b. it is accompanied by a painting.
c. it explores nature and captures the essence of a moment.
d. it describes a natural phenomenon and its effect on people.

Haiku is the Japanese poetry and consists of three lines and these lines rarely rhymes
It explores nature and captures the essence of a moment.
it is mostly written on nature and describes its beauty and essence
and most demanding poetry
so correct option is C 
hope it helps

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