Jillian is a 69-year-old woman. Lately, she has been having difficulty remembering things, and she is also getting into meaningless quarrels with her family members. Jillian's symptoms are most likely associated with the deficiency of in her diet

Vitamin B12 is the correct answer

Explanation:

Vitamin B12 low levels and deficiency in the human body can cause memory loss that occurs because of people suffering from pernicious anemia.

Deficiency of vitamins B12 can increase the risk of Parkinson's disease and Alzheimer's disease.

Vitamin B12 is required to keep the nerve cell and blood cells healthy and also to keep the functioning of the brain healthy.

Vitamins B12 is required to improve the people's memory and good sources of Vitamin B12 are animal liver, sardines, beef, Fortified cereal, fish, milk products and eggs.

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