Step 1: Understanding water-soluble vitamins.
Water-soluble vitamins are those that dissolve in water and are easily absorbed by the body. These include the B vitamins and vitamin C. They are not stored in large amounts in the body and need to be consumed regularly.
Step 2: Analyzing the options.
(A) Vitamin A and B: Vitamin A is fat-soluble, so this combination is incorrect.
(B) Vitamin B and C: Correct — Both vitamin B (a group of vitamins) and vitamin C are water-soluble.
(C) Vitamin E and K: These are fat-soluble vitamins, so this option is incorrect.
(D) Vitamin C and D: Vitamin D is fat-soluble, making this option incorrect.
Step 3: Conclusion.
The correct answer is (B) Vitamin B and C, as these are the water-soluble vitamins.