Beri Beri is a disease caused by a deficiency of Vitamin B1. Option 1, Vitamin B2, is incorrect because it is not related to Beri Beri. Option 3, Vitamin B12, is also incorrect because Vitamin B12 deficiency leads to a different condition called pernicious anemia. Option 4, Vitamin E, is incorrect because Vitamin E deficiency causes a different set of symptoms. Vitamin B1, also known as thiamine, is essential for the proper functioning of the nervous system and metabolism of carbohydrates. A deficiency of Vitamin B1 can lead to symptoms such as muscle weakness, loss of appetite, fatigue, and neurological problems. Therefore, the correct answer is option 2, Vitamin B1.