Each Is True of Vitamin Requirements and Deficiencies,except One

Each is true of vitamin requirements and deficiencies,except one.Which is the exception?

A) Many factors, such as alcohol use and stress, modify an individual's requirement.
B) Periods of stress elevate metabolic activity, which affects vitamin requirements.
C) A nutritional deficiency occurs if a nutrient is unavailable to sustain biochemical functions.
D) Although nutrients rely on each other for utilization, they are not considered codependent.