Choose the appropriate preposition for the given sentence:
The sun has gone ______ a cloud.

- 'after' means next to and following in order or importance.
- 'by' is used for indicating the location of a physical object beside a place or object.
-  'behind' means following or further back than someone or something.
-  'before' means during the period of time preceding (a particular event or time).
Hence, the correct answer is option 3.
Complete Sentence: The sun has gone behind a cloud.