A ninth-grade student's invention of "intelligent constant temperature energy-saving and water-saving system of solar water heater bathroom" won the utility model patent of the State Patent Office.

D

Analysis of test questions: This question aims to examine students' understanding of the right to intellectual achievements. According to the knowledge of teaching materials, intellectual property right is also called intellectual property right, which usually includes copyright, patent right and trademark right, as well as trade secrets in anti-unfair competition. Obtaining patent authorization on materials is a patent right, that is, the right of intellectual achievements. So the correct answer is D.