Based on the information provided, a valid inference about Jules Verne from the excerpt would be:
- Jules Verne was a popular author.
This inference is drawn from the context that suggests he had a significant impact on literature and public interest, particularly with themes related to travel and adventure, which are relevant to Nellie Bly's undertaking. The other options do not have enough support in a typical excerpt discussing Bly's experiences and connections to Verne.