Final answer:
Individuals with celiac disease have damaged microvilli in the small intestine, leading to poor absorption of fats and consequently, the inability to absorb fat-soluble vitamins (A, D, E, and K).
Step-by-step explanation:
Clients with celiac disease don't absorb fats well due to the damage gluten causes to the microvilli in their small intestine. The microvilli are crucial for nutrient absorption, and when they are damaged, this impairs the client's ability to absorb certain nutrients. Consequently, they struggle with the absorption of fat-soluble vitamins, which include vitamins A, D, E, and K. These vitamins are typically absorbed in the presence of dietary lipids in structures called micelles via simple diffusion. Therefore, the correct answer is B) Fat-soluble vitamins.