Which pair of water soluble vitamins, belonging to the B complex and C group, is correctly identified as being soluble in water rather than in fat?

Introduction / Context:
Vitamins are essential micronutrients that are grouped according to their solubility. Some vitamins are fat soluble and can be stored in body fat, while others are water soluble and are not stored to a large extent. Knowing which vitamins are water soluble is important for understanding nutrition, deficiency diseases, and how vitamins are absorbed and excreted. This question asks you to identify the correct pair of water soluble vitamins from the given options.

Given Data / Assumptions:

• The focus is on water soluble vitamins.
• Options pair different vitamins such as A, B, C, D, and K.
• We must choose the pair in which both vitamins are water soluble.
• We assume standard classification of vitamins into water soluble and fat soluble groups.

Concept / Approach:
Water soluble vitamins include all B complex vitamins and vitamin C. These vitamins dissolve in water, are not stored extensively in the body, and excess amounts are usually excreted in urine. Fat soluble vitamins are vitamins A, D, E, and K, which dissolve in fat, are stored in body tissues, and can accumulate if taken in excess. Therefore, the correct pair of water soluble vitamins must consist only of B group vitamins and vitamin C, not of vitamins A, D, E, or K.

Step-by-Step Solution:
Step 1: List the water soluble vitamins: Vitamin C and all B complex vitamins. Step 2: List the fat soluble vitamins: Vitamin A, D, E, and K. Step 3: Examine each option and note which vitamins are included in each pair. Step 4: Identify the pair in which both members belong to the water soluble group. Step 5: Recognize that only the pair “Vitamin B and Vitamin C” satisfies this condition and select it.

Verification / Alternative check:
You can quickly verify by recalling that nutrition textbooks often present this split: “Water soluble: B and C; Fat soluble: A, D, E, K.” Many exam questions directly ask you to remember this grouping. Since B and C are always grouped together as water soluble, any option that pairs these two is likely to be correct. On the other hand, vitamins A and D are known for their roles in vision and bone health and are repeatedly described as fat soluble, not water soluble.

Why Other Options Are Wrong:
Vitamin A and Vitamin B, both treated as water soluble: Vitamin B is water soluble but vitamin A is fat soluble, so the pair is incorrect. Vitamin C and Vitamin D, both classified as water soluble: Vitamin C is water soluble but vitamin D is fat soluble, so this pair is also incorrect. Vitamin A and Vitamin K, both water soluble: Both A and K are fat soluble, so this pair does not represent water soluble vitamins. Vitamin E and Vitamin K, both primarily water soluble: Vitamins E and K are fat soluble vitamins, so this pair is not correct for water solubility.

Common Pitfalls:
A common error is to assume that because a vitamin is important for health, it must be water soluble. Some students also incorrectly think that vitamins associated with bone or blood clotting, such as D and K, might be water soluble due to their critical roles. It is important to memorize the simple grouping “B and C are water soluble” and “A, D, E, K are fat soluble.” This clear classification will help you answer many related questions in biology and general science examinations without confusion.

Final Answer:
Thus, the correct pair of water soluble vitamins is Vitamin B and Vitamin C, which dissolve in water.