The correct answer is C. Mark Twain is a well-known author
Step-by-step explanation:
A research report is mainly an academical paper widely used in different education levels that aims at reporting or showing what you have found after a process of research that can involve looking for documents, web sites, doing surveys and other researching tools usually related to some specific topic or issue and guided by a main claim or position called thesis statement the author wants to prove or disprove.
Additionally, whether the topic to be researched and thesis statement is broad or specific depends on the time, resources, requirements and length of the research report. But in any case, the thesis statement should be broad enough to allow the author to show his position through evidence and multiple reasons, but narrow enough to accomplish the time to complete the report and the length of it. Considering this the thesis statement that is too narrow even for a short report is "Mark Twain is a well-known author" because this thesis statement can be proved just by using some statistical information or providing examples but does not allow the author to have a broad discussion, look for multiple resources or provide multiple perspectives to prove his point which is the purpose of this type of report.