Answer:
The correct answer is: Yeah, you could say I’m extremely upset!
Explanation:
Understatement refers to a rhetorical device where a speaker or author underplays his/her reaction to an event or experience, that would normally elicit a strong emotional reaction- such as anger, surprise or joy.
In this instance, the author's brand-new car's bumper was scraped, which would normally elicit a surprised, angry or upset reaction. Yet, the author downplays his/her reaction by merely saying "Yeah, you could say I’m extremely upset!". This reaction is an understatement as a typical reaction would involve a stronger expression of surprise, anger and/or upset.
