Select the option that can be used as a one-word substitute for the given group of words.
A person who investigates, reports on, and helps settle complaints

* Ombudsman is an official appointed to investigate individuals' complaints against maladministration, especially that of public authorities.
Spokesman is a person who speaks on behalf of a group.

Bildungsroman is a literary genre focusing on the psychological and moral growth of the protagonist.

Superhuman refers to someone with exceptional capabilities beyond human limits.