Which sentence is an example of a closed thesis statement?

Robinson, using various persuasive techniques, presents a compelling argument that the liberal arts should provide the underpinning for all higher education disciplines.
Using various effective rhetorical techniques, Robinson presents a compelling argument that the liberal arts should provide the basis for all higher education.
Robinson uses statistics, quotes from experts, and a number of anecdotes to argue in favor of the liberal arts as the foundation for all educational disciplines.
Robinson presents a compelling and well-supported argument that the liberal arts should provide the foundation for university education in all disciplines.