Final answer:
The line 'the sun was like a red balloon in the sky' is an example of simile in English.
Step-by-step explanation:
The line 'the sun was like a red balloon in the sky' is an example of simile in English. A simile is a figure of speech that compares two unlike things using the words 'like' or 'as'. In this case, the author is comparing the sun to a red balloon to create a vivid image in the reader's mind.