Concept:
Living organisms require food for energy, growth, repair, and maintenance. The overall process of obtaining and using food is called nutrition.
Step 1: Define nutrition.
Nutrition includes:
• Ingestion of food
• Digestion
• Absorption
• Assimilation and utilization
Step 2: Analyze the given options.
• (A) Emulsification → Breakdown of fats into small droplets $\times$
• (B) Biofortification → Improving nutritional value of crops $\times$
• (C) Respiration → Release of energy from food $\times$
• (D) Nutrition → Consumption and utilization of food \checkmark
Step 3: Conclusion.
\[
\text{Process of consuming and utilizing food = Nutrition}
\]