Answer:
An informal text is when texts or passages aren't formal. Words are not polite but at the same time they have meaning. Informal text are more personal and much more casual.
Step-by-step explanation:
Formal means polite, clean, and nice. So when you add the "in" in "informal" that would make the word opposite of "formal". Since you didn't put what the "following" or what the answer choices are, this is the best I can do.
I hope this helps and if not try reposting with a picture or with answer choices!