Final answer:
The information not in the article is when the word 'manga' was first used.
Step-by-step explanation:
The information not in the article is: B. When the word 'manga' is known to have been used for the very first time. The article mentions the influence of reading material of U.S. troops on modern manga artists, the popularity of manga outside of Japan, and the content of 12th-century scrolls illustrating stories. However, it does not provide information about the specific time when the word 'manga' was first used.