Please select the best answer from the choices provided.
The best answer is A. True.
The statement indicates that one-fourth of adults in the United States are not active at all. This aligns with data and studies that suggest a significant portion of the adult population does not engage in regular physical activity. While the exact percentage may vary based on the source and the specific definition of "active," the claim that approximately 25% (one-fourth) of adults are inactive is a commonly referenced statistic in health and fitness reports. Therefore, the answer is true based on this context.