Answer: D. humorous and informal.
The author is using a humorous and informal voice to tell the story. He refers to himself as "absent-minded and ditzy," which gives the passage a silly tone. Moreover, the author gives examples of cases in which these qualities have been displayed. These examples are comical, such as the mismatched socks or the paint in hair. Finally, the author uses exclamation marks, common language and a fast pace to give the passage an informal tone.