Science writer: The deterioration of cognitive faculties associated with Alzheimer' s disease is evidently caused by the activities of microglia -- the brain' s own immune cells. For one thing, this deterioration can be slowed by some anti-inflammatory drugs, such as acetylsalicylic acid. Furthermore, patients with Alzheimer' s are unable to eliminate the protein BA from the brain, where it accumulates and forms deposits. The microglia attack these protein deposits by releasing poisons that destroy surrounding healthy brain cells, thereby impairing the brain' s cognitive functions. Which one of the following, if true, most helps to support the science writer's argument? ['Acetylsalicylic acid reduces the production of immune cells in the brain.', "Immune reactions by microglia occur in certain diseases of the brain other than Alzheimer's.", "The inability of Alzheimer's patients to eliminate the protein BA from the brain is due to a deficiency in the brain's immune system.", 'The protein BA directly interferes with the cognitive functions of the brain.']