Question

question 4
to keep a healthy brain you need to have a good diet. vitamin e, magnesium, iron, and zinc helps —.
a. in mental and physical longevity
b. improve the cognitive function of demented patients
c. protect the brain and its memories
d. improve social behavior of demented patients

Explanation:

Vitamin E is an antioxidant that protects cells from damage, magnesium is involved in many biochemical reactions in the body including those related to nerve function, iron is crucial for oxygen transport (and the brain needs oxygen), and zinc is important for brain development and function. These nutrients work together to safeguard the brain and its memories. Options A is too broad as it's not specifically about brain health. Options B and D are more related to specific patient groups (demented patients) and specific functions (cognitive and social behavior) which is not the most general and direct role of these nutrients for overall brain health as stated in the question's context of "keeping a healthy brain".

Answer:

C. Protect the brain and its memories