A new study suggests that regular consumption of fermented foods can improve gut health. Researchers concluded that incorporating these foods into one's diet can significantly boost overall immunity. Which of the following, if true, most strengthens the researchers' conclusion?
✓ Correct Answer: Option B
The argument links fermented foods to gut health, and then gut health to immunity. Option B strengthens the crucial second link by establishing that gut health (specifically the microbiome) directly impacts the immune system.