Final answer:
While the exact percentage of preventable neurocognitive disorders through healthy lifestyle choices is not explicitly provided, we can infer that such behaviors significantly reduce the risk of many chronic diseases. Therefore, option b (35%) could be an educated estimate for the question.
Step-by-step explanation:
According to your textbook regarding neurocognitive disorders and given the context of the provided information, the answer to the question is an estimation and the correct answer is not explicitly stated in the provided material.
However, given that lifestyle choices including diet, exercise, and abstaining from tobacco use can significantly prevent chronic noninfectious diseases, it is possible to draw parallels and infer that a substantial percentage of neurocognitive disorders might also be preventable through similar means. Drawing from the relationship between lifestyle choices and disease prevention discussed in the material, if we had to choose the best estimate, 35% might be a reasonable guess for the percentage of all neurocognitive disorders preventable through healthy lifestyle choices, including proper diet, exercise, and abstaining from tobacco use.