Step 1: Understanding the Concept:
Emulsifiers are used in ice cream for specific functions.
The choice of emulsifier depends on the fat source.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the emulsifiers for butter-based ice cream.
Step 3: Detailed Explanation:
Egg yolk solids are desirable emulsifiers for butter or butter oil mixes.
They contain natural emulsifiers (lecithin).
Tween 80, glycerol monostearate, and sodium stearoyl lactylate are synthetic.
Thus, egg yolk solids are the preferred source.
Step 4: Final Answer:
Egg yolk solids are desirable as emulsifiers for butter-based ice cream.
Hence, the correct option is (B).