There are 4 different fat-soluble vitamins and ____ different water-soluble vitamins in total. While excess fat-soluble vitamins can be stored in the body, excess water-soluble vitamins are mostly _______.

• A. Nine; excreted in urine.
• B. Eight; excreted in urine.
• C. Nine; stored in the blood.
• D. Eight; stored in the blood.

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the classification of vitamins. Vitamins are categorized into two groups: fat-soluble and water-soluble. Fat-soluble vitamins include A, D, E, and K, while water-soluble vitamins include the B-complex group and vitamin C.
2. Step 2: Count the total number of water-soluble vitamins. The B-complex group consists of eight vitamins (B1, B2, B3, B5, B6, B7, B9, and B12), and vitamin C is also water-soluble. This makes a total of nine water-soluble vitamins.
3. Step 3: Learn the storage and excretion mechanisms. Fat-soluble vitamins can be stored in the liver and fatty tissues, while excess water-soluble vitamins are not stored and are typically excreted in urine.
4. Step 4: Analyze the answer choices. The correct answer must reflect the total number of water-soluble vitamins and their excretion mechanism. Based on the information, the correct number is nine, and the excretion method is through urine.
5. Step 5: Select the correct answer from the options provided. Match the information you have learned with the answer choices to identify the correct one.