The daily requirement of vitamin B12 is:

 # The daily requirement of vitamin B12 is: 
A. 0.25-0.67 mcg per day
B. 3-5 mcg per day
C. 0.5-0.7 mcg per day
D. 1-2 mcg per day

The correct answer is D. 1-2 mcg per day.

Vitamin B12 plays a crucial role in maintaining healthy nerve function, supporting red blood cell production, and aiding in DNA synthesis. This range is in line with the daily recommended intake for vitamin B12 for most adults, which is typically around 2.4 mcg per day according to various health guidelines.

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