It can be inferred from the stories that the central ideas are similar as D. Both texts highlight the need for activities that challenge your brain and improve memory.
A central idea simply has to do with the main idea that can be found in an article or story.
In this case, the main idea is that brain health is an important part of overall health and wellness and that exercising your memory is an important part of maintaining a healthy brain.
The central idea of “Online Programs to Train Your Brain” is brain health is an important part of overall health and wellness and the other central idea is to continue to learn new things and exercise your memory.
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