The correct answer is:
a concise summary of the central idea of a text.
A thesis statement is a specific, focused statement that articulates the main argument or central idea of a text, typically found in essays or academic papers. It serves as a roadmap for the reader, indicating what to expect in the following content and guiding the direction of the argument. It is not just about providing information or summarizing points, but rather stating the primary claim or position that will be supported and developed throughout the text.