In a college-level nutrition context, which statement correctly interprets a recommended intake of 2.4 micrograms (mcg) of vitamin B12 for an adult?

• A. It equals 2.4 mcg, which is $0.24 \mathrm{mg}$ of vitamin B12.
• B. It equals 2.4 mcg, which is $0.0024 \mathrm{mg}$ of vitamin B12.
• C. It equals 2.4 mcg, which is $0.024 \mathrm{mg}$ of vitamin B12.
• D. It equals 2.4 mcg, which is $2.4 \mathrm{mg}$ of vitamin B12.

Answer: (B)

Verified step by step guidance

1. Understand the units involved: micrograms (mcg) and milligrams (mg) are both units of mass, where 1 mg equals 1000 mcg.
2. Set up the conversion factor between micrograms and milligrams: \(1\ \text{mg} = 1000\ \text{mcg}\).
3. To convert 2.4 mcg to mg, use the formula: \(\text{mg} = \frac{\text{mcg}}{1000}\).
4. Substitute the given value into the formula: \(\text{mg} = \frac{2.4}{1000}\).
5. Simplify the fraction to find the equivalent amount in milligrams, which will help identify the correct interpretation.