Answer: The sentence which uses informal language is, I think that's pretty much all late for breakfast every day.
Explanation:
Informal language is a colloquial language which is often used in casual conversation. Such language cannot be used in academic writing. The passage mentioned above describes about the Paris trip.
If we look at the ending statement in the passage, ‘I think that's pretty much all late for breakfast every day’ we will notice that it contains a informal language which is ‘pretty much.’ The formal word for this term is ‘almost’ or ‘nearly’ which can be used in professional writing.
Answer:
its is an informal letter
